taxonID	type	description	language	source
D5449F1A283E5BF2A02036A6289D9AC3.taxon	description	Figs 7 A, 8 A	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
D5449F1A283E5BF2A02036A6289D9AC3.taxon	etymology	Etymology. Alabastrinus (Lat., adj.) – alabaster-like; in reference to the hymenium colours.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
D5449F1A283E5BF2A02036A6289D9AC3.taxon	description	Description. Basidiocarps effused, up to 5 cm in widest dimension, smooth or indistinctly tuberculate, gelatinous, opalescent, greyish-white, often with reddish-brown spots, 0.5 – 1 mm thick, in dry condition opaque, pinkish-grey or grey, with vinaceous-brown or brownish-black stains, crustose, margin sharply delimited, usually slightly elevated, adnate or detaching, concolourous with hymenial surface. Hyphal structure monomitic, hyphae hyaline or brownish, clamped; subicular hyphae thick-walled, subparallel, 3 – 5 μm in diam., subhymenial hyphae thin- to slightly thick-walled, interwoven or ascending, densely arranged, 2 – 4 μm in diam., with occasional inflations up to 6 μm in diam. Cystidia abundant, hyaline, clavate to somewhat tapering, 20 – 30 × 5 – 8 μm, slightly projecting. Hyphidia abundant, richly branched, 1 – 2 μm in diam. at the apex, usually forming a continuous layer up to 15 μm thick. Basidia four-celled, longitudinally septate, ovoid-ellipsoid to obconical, pedunculate (petiolate), (16 –) 17 – 27.5 (– 30) × (9.8 –) 10.1 – 14.0 (– 14.3) μm (n = 30 / 2), stalk up to 26 × 5 – 6 μm, narrowing to the base, sterigmata tubular, gradually tapering, up to 23 × 3 – 4 μm. Basidiospores smooth, thin-walled, broadly ellipsoid to ellipsoid, (8.0 –) 8.6 – 12.2 (– 12.3) × (5.7 –) 5.9 – 8.1 (– 8.2) μm (n = 50 / 2), L = 10.23 – 10.32, W = 7.03 – 7.20, Q’ = (1.2 –) 1.3 – 1.7 (– 1.8), Q = 1.43 – 1.48.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
D5449F1A283E5BF2A02036A6289D9AC3.taxon	distribution	Distribution and ecology. East Asia (Russian Far East); corticated logs or still-attached branches of deciduous trees (mostly Populus) along riversides.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
496E9FBA81DB524A96903734A15C5B62.taxon	etymology	Etymology. Elmericium – derived from Elmerina, a phylogenetically close and anatomically similar genus, and Corticium, in reference to the crust-like basidiocarps.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
496E9FBA81DB524A96903734A15C5B62.taxon	description	Description. Basidiocarps effused, smooth or nearly so, gelatinous, opalescent or opaque, light-coloured, margin sharply delimited. Hyphal structure monomitic, hyphae hyaline or brownish, clamped. Cystidia present, hyaline, thin-walled, clavate to somewhat tapering. Hyphidia abundant, richly branched, forming a continuous layer. Basidia four-celled, longitudinally septate, ovoid-ellipsoid to obconical, petiolate, embedded. Basidiospores smooth, thin-walled, broadly ellipsoid to ellipsoid. On dead wood of deciduous trees.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
496E9FBA81DB524A96903734A15C5B62.taxon	type_taxon	Type species. Elmericium alabastrinum.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
2AC14923B74C5E4A9ABC939BE380EDA5.taxon	description	Fig. 8 B	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
2AC14923B74C5E4A9ABC939BE380EDA5.taxon	etymology	Etymology. Fessulus (Lat., adj.) – limp; in reference to quickly collapsing hyphae.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
2AC14923B74C5E4A9ABC939BE380EDA5.taxon	description	Description. Basidiocarps effused, up to 4 cm in widest dimension, smooth or tuberculate, gelatinous, semitranslucent, greyish, 0.4 – 0.7 mm thick, in dry condition vernicose, hardly visible, margin gradually thinning-out. Hyphal structure monomitic, hyphae hyaline, clamped; subicular hyphae with a distinct wall, interwoven, 2 – 4 μm in diam., subhymenial hyphae thin-walled, quickly collapsing, ascending or interwoven, 2 – 3 μm in diam. Cystidia absent. Hyphidia abundant, richly branched, 0.5 – 1 μm in diam. at the apex, partly covering hymenial cells. Basidia four-celled, longitudinally septate, broadly ellipsoid to globose, pedunculate, (8.7 –) 8.8 – 10.2 (– 10.8) × (7.2 –) 7.3 – 8.7 (– 9.0) μm (n = 20 / 1), stalk distinct, up to 30 × 1.5 – 2.5 μm, sterigmata gradually tapering, occasionally bifurcate, up to 25 × 1.8 – 2.2 μm. Basidiospores smooth, thin-walled, broadly cylindrical to broadly ellipsoid, more rarely lacrymoid or ovoid, (5.2 –) 5.3 – 7.2 × (3.8 –) 4.0 – 5.2 (– 5.4) μm (n = 30 / 1), L = 6.31, W = 4.58, Q’ = (1.2 –) 1.3 – 1.6 (– 1.7), Q = 1.39, often with a large central oil drop.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
2AC14923B74C5E4A9ABC939BE380EDA5.taxon	distribution	Distribution and ecology. Europe (Finland); decorticated coniferous logs (Picea).	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
D3D2B530A258557FA9DBB0AB4EE99D87.taxon	description	Figs 6 A, 7 B, 8 C	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
D3D2B530A258557FA9DBB0AB4EE99D87.taxon	etymology	Etymology. Trichiesianus (Lat., adj.) – in homage to Gérard Trichies, a famous discoverer of minuscule heterobasidiomycetes.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
D3D2B530A258557FA9DBB0AB4EE99D87.taxon	description	Description. Basidiocarps effused, up to 3 cm in widest dimension, tuberculate, gelatinous, opalescent, cream-coloured to pale ochraceous, 0.2 – 0.3 mm thick, in dry condition ochraceous-brown, vernicose, margin gradually thinning-out. Hyphal structure monomitic, hyphae hyaline, clamped; subicular hyphae thin-walled, interwoven or subparallel, 2 – 3 μm in diam., subhymenial hyphae very thin-walled, quickly collapsing, interwoven, rather densely arranged and partly glued together, 1 – 2 (– 2.5) μm in diam. Cystidia absent. Hyphidia abundant, richly branched, 0.8 – 1.2 μm in diam. at the apex, partly covering hymenial cells. Basidia four-celled, longitudinally septate, broadly ellipsoid to globose, sessile or pedunculate, (8.0 –) 8.2 – 9.8 (– 10.1) × (7.4 –) 7.8 – 8.8 (– 9.0) μm (n = 20 / 1), stalk usually strongly reduced, up to 3 × 2 μm, sterigmata gradually tapering, up to 18 × 1.5 – 2 μm. Basidiospores smooth, thin-walled, ellipsoid to broadly ellipsoid, the longest spores broadly cylindrical and sometimes slightly curved, (5.1 –) 5.2 – 7.0 (– 7.2) × (3.7 –) 3.8 – 4.7 (– 4.8) μm (n = 30 / 1), L = 6.08, W = 4.21, Q’ = (1.2 –) 1.3 – 1.7 (– 1.8), Q = 1.45, often with a large central oil drop.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
D3D2B530A258557FA9DBB0AB4EE99D87.taxon	distribution	Distribution and ecology. South America (French Guiana); decorticated, decayed angiosperm wood.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
2A23DBE006C45B378C9150789EB51BB8.taxon	description	Description. Basidiocarps effused, continuous, smooth or tuberculate, gelatinous, thin. Hyphal structure monomitic; hyphae clamped. Cystidia absent; hyphidia present, richly branched, 0.5 – 1.5 μm in diam. Basidia four-celled, longitudinally septate, broadly ellipsoid to globose, pedunculate (stalk occasionally reduced). Basidiospores hyaline, thin-walled, broadly cylindrical or broadly ellipsoid to globose. On rotten wood.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
F29959B61F085E358F326EE57FE01EDD.taxon	description	Figs 6 B, 8 D	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
F29959B61F085E358F326EE57FE01EDD.taxon	etymology	Etymology. Chromaticus (Lat., adj.) – chrome-yellow, in reference to the basidiocarp’s colour.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
F29959B61F085E358F326EE57FE01EDD.taxon	description	Description. Basidiocarps effused, first small, then fusing together and reaching up to 20 cm in longest dimension, indistinctly or clearly tuberculate, gelatinous, semitranslucent, containing numerous chrome-yellow grains, 0.1 – 0.4 mm thick, drying to a bright-yellow thin crust, margin gradually thinning out. Hyphal structure monomitic, hyphae hyaline, clamped, richly encrusted by chrome-yellow angular crystals occasionally fusing together in large amorphous concretions; subicular hyphae thin-walled or with a distinct wall, interwoven, anastomosing, 2 – 4 μm in diam. (occasionally inflated up to 6 μm in diam.), subhymenial hyphae thin-walled, quickly collapsing, interwoven, 2 – 3 μm in diam. Cystidia absent. Hyphidia scattered, simple or sparsely branched, 1 – 1.5 μm in diam. at the apex. Basidia four-celled, longitudinally septate, broadly ellipsoid to globose, pedunculate, (8.3 –) 8.7 – 11.0 (– 11.2) × (7.8 –) 8.0 – 9.0 (– 9.2) μm (n = 20 / 2), stalk usually distinct, up to 15 × 2 – 3 μm, sterigmata gradually tapering, up to 20 × 1.5 – 2 μm. Basidiospores smooth, thin-walled, ellipsoid to broadly ellipsoid or subglobose, more rarely globose, (4.2 –) 4.7 – 6.1 (– 6.2) × (3.6 –) 3.8 – 5.2 (– 5.4) μm (n = 60 / 2), L = 5.20 – 5.31, W = 4.46 – 4.78, Q’ = (1.0 –) 1.1 – 1.3 (– 1.4), Q = 1.09 – 1.20, often with a large central oil drop.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
F29959B61F085E358F326EE57FE01EDD.taxon	distribution	Distribution and ecology. Europe (Slovenia); fallen decorticated logs of conifers (Abies).	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
83D9FC382B005F4899C1B1C5B4ECEA15.taxon	description	Description. Basidiocarps appearing as small gelatinous outgrowths on a hardly visible joint subiculum, later fusing into reticulate or continuous compound fructifications. Hyphal structure monomitic, hyphae clamped. Tramal cystidia tubular, slightly tapering upwards, apically blunt, or absent. Gloeocystidia (if present) running more or less parallel to tramal cystidia. Basidia two – four-celled, pedunculate, with slender, distantly located sterigmata. Basidiospores thin-walled, subglobose, repetitive, often with one large oil drop.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
83D9FC382B005F4899C1B1C5B4ECEA15.taxon	type_taxon	Type species. Dacrymyces vermiformis Berk. & Broome.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
83D9FC382B005F4899C1B1C5B4ECEA15.taxon	discussion	The generic description of Mycostilla is amended here to encompass a new species, M. chromatica. In contrast to the generic type, M. vermiformis, it has continuous (not reticulate) basidiocarps and lacks cystidia. Nevertheless, it is phylogenetically quite close to M. vermiformis and is therefore described as a Mycostilla. Basidia of both species are of the same shape (slightly larger in M. chromatica than in M. vermiformis), and basidiospores are nearly identical.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
CA437C0D10175983A2240B86890D45C2.taxon	description	Fig. 9 C	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
CA437C0D10175983A2240B86890D45C2.taxon	etymology	Etymology. Denticulatus (Lat., adj.) – possessing small teeth.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
CA437C0D10175983A2240B86890D45C2.taxon	description	Description. Basidiocarps effused, small and inconspicuous, up to 8 mm in widest dimension, semitranslucent, gelatinous, greyish, adnate, almost invisible in dry condition; hymenophore hydnoid, spines rather regularly arranged, acute, single, up to 0.1 mm long, 5 – 6 per mm; subiculum watery greyish, semitranslucent, 0.02 – 0.03 mm thick; margin gradually thinning-out. Hyphal structure monomitic, hyphae hyaline, clamped; subicular hyphae thin-walled, subparallel, hardly discernible, 1 – 2 μm in diam., subhymenial hyphae ascending or interwoven, thin-walled, and quickly collapsing, (1.0 –) 1.1 – 2.5 (– 2.6) μm in diam. (n = 20 / 1). Crystals absent. Hyphidia abundant, richly branched, 1 – 1.5 μm in diam. in the apical part, distributed among basidia and partly covering basidial cells. Basidia two – four-celled, longitudinally septate, broadly ellipsoid to subglobose, pedunculate, (6.5 –) 7.0 – 8.6 (– 8.9) × (5.8 –) 6.0 – 7.5 (– 7.8) μm (n = 20 / 1), scattered, stalk up to 15 × 1.5 – 2 μm, sterigmata up to 10 × 2 – 2.2 μm, sometimes bifurcate. Basidiospores narrowly ellipsoid to broadly cylindrical, occasionally slightly concave on the ventral side, (5.0 –) 5.1 – 7.0 (– 7.3) × 3.0 – 4.2 (– 4.8) μm (n = 33 / 1), L = 6.18, W = 3.57, Q’ = (1.2 –) 1.4 – 2.0 (– 2.1), Q = 1.75, usually with a large central oil drop.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
CA437C0D10175983A2240B86890D45C2.taxon	distribution	Distribution and ecology. Europe (Sweden); fallen angiosperm branches (Sorbus).	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
495A73B43EAB5062BDB95B2D9F91AD6C.taxon	description	Figs 6 C, 8 E	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
495A73B43EAB5062BDB95B2D9F91AD6C.taxon	etymology	Etymology. Guianensis (Lat., adj.) – originating from French Guiana.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
495A73B43EAB5062BDB95B2D9F91AD6C.taxon	description	Description. Basidiocarps first appearing as small pustules, 0.03 – 0.05 mm in diam., then fusing together and forming a compound basidiocarp, up to 3 cm in widest dimension, indistinctly tuberculate, gelatinous, opalescent, greyish, 0.1 – 0.2 mm thick, in dry condition vernicose, hardly visible, margin sharply delimited, adnate. Hyphal structure monomitic, hyphae hyaline, clamped, frequently anastomosing; subicular hyphae with a distinct wall, interwoven or subparallel, 1.5 – 5 (6) μm in diam., often slightly inflated at septa, subhymenial hyphae thin-walled or with a distinct wall, tightly glued together, ascending or interwoven, 1 – 4 μm in diam. Cystidia rare, distinctly tapering to almost subulate, 16 – 26 × 5.0 – 8.4 μm (n = 5 / 1), projecting up to 15 μm above hymenial layer. Hyphidia richly branched, 1 – 1.5 μm in diam. at the apical part, scattered among basidia. Basidia four-celled, longitudinally septate, ellipsoid to broadly ellipsoid, pedunculate, (7.7 –) 7.8 – 9.4 (– 9.7) × (6.5 –) 6.6 – 7.2 (– 7.3) μm (n = 20 / 1), stalk distinct although sometimes strongly reduced, up to 10 × 2 – 2.5 μm, sterigmata gradually tapering, rarely bifurcate, up to 10 × 1.2 – 1.5 μm. Basidiospores smooth, thin-walled, narrowly ellipsoid to cylindrical, the longest spores often slightly curved, (5.4 –) 5.6 – 7.3 (– 7.8) × (3.0 –) 3.1 – 4.1 (– 4.4) μm (n = 36 / 1), L = 6.65, W = 3.71, Q’ = (1.4 –) 1.5 – 2.1 (– 2.3), Q = 1.80.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
495A73B43EAB5062BDB95B2D9F91AD6C.taxon	distribution	Distribution and ecology. South America (French Guiana); decorticated angiosperm wood.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
E4165DD1FBAE5B6DB056DCEA3A8A44F6.taxon	description	Fig. 8 F	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
E4165DD1FBAE5B6DB056DCEA3A8A44F6.taxon	description	Description. Basidiocarps first pustular, 0.2 – 0.4 mm in diam., then fusing together and forming a compound basidiocarp, up to 5 mm in widest dimension, indistinctly tuberculate, gelatinous, opalescent, whitish, 0.1 – 0.2 mm thick, in dry condition hardly visible, margin sharply delimited, adnate. Hyphal structure monomitic, hyphae hyaline, clamped; subicular hyphae totally collapsed, subhymenial hyphae thin-walled, ascending, 1.5 – 2.5 μm in diam. Hyphidia abundant, richly branched, 1 – 2 μm in diam. at the apical part, scattered among basidia and partly covering basidial cells. Basidia four-celled, longitudinally septate, ellipsoid to broadly ellipsoid, pedunculate, (8.1 –) 8.3 – 9.2 (– 10.6) × (6.2 –) 6.5 – 8.2 (– 8.6) μm (n = 20 / 1), stalk up to 15 × 2 – 2.5 μm, sterigmata up to 7 × 1.5 μm. Basidiospores smooth, thin-walled, narrowly ellipsoid to ellipsoid or more rarely cylindrical, (5.0 –) 5.7 – 8.2 (– 8.9) × (3.4 –) 3.6 – 5.0 (– 5.1) μm (n = 30 / 1), L = 6.99, W = 4.30, Q’ = (1.3 –) 1.4 – 2.0 (– 2.2), Q = 1.63.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
0B4CDC5938C25014B737D159FF4CC744.taxon	description	Fig. 9 A, B, D	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
0B4CDC5938C25014B737D159FF4CC744.taxon	description	Description. Basidiocarps effused, covering a few mm, semitranslucent, gelatinous, whitish or greyish, adnate; hymenophore hydnoid, spines regularly arranged, acute, single or fasciculate, 0.1 – 0.5 mm long, 5 – 7 per mm; subiculum first watery greyish, semitranslucent, then whitish, opaque, sometimes shining, 0.02 – 0.05 mm thick; margin gradually thinning-out. Hyphal structure monomitic, hyphae hyaline, clamped; subicular hyphae thin-walled, predominantly subparallel, 1 – 3 μm in diam., tramal hyphae subparallel, subhymenial hyphae ascending, very thin-walled, and quickly collapsing, (1.2 –) 1.6 – 2.6 (– 3.2) μm in diam. (n = 60 / 3). Acicular crystals abundant among hyphal tissues, often aggregated in large groups up to 20 μm in the widest dimension. Hyphidia abundant, simple to branched, 1 – 1.5 μm in diam. at the apical part, distributed among basidia. Basidia four-celled, longitudinally septate, broadly ellipsoid to subglobose, pedunculate, (6.7 –) 6.8 – 9.5 (– 9.8) × (5.3 –) 5.8 – 7.3 (– 7.4) μm (n = 32 / 3), scattered, stalk up to 12 × 2 – 2.5 μm, sterigmata up to 7 × 1.5 – 2 μm. Basidiospores cylindrical to broadly cylindrical, often slightly curved, (4.6 –) 4.9 – 7.6 (– 8.2) × (2.6 –) 2.7 – 4.0 (– 4.4) μm (n = 90 / 3), L = 5.50 – 6.28, W = 3.29 – 3.35, Q’ = (1.4 –) 1.5 – 2.3 (– 2.6), Q = 1.68 – 1.89.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
0B4CDC5938C25014B737D159FF4CC744.taxon	distribution	Distribution and ecology. Europe (France, Spain, United Kingdom); strongly decomposed wood of angiosperms.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
82452FD4876450E98EE2DCB4CF539DE6.taxon	description	Fig. 9 E	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
82452FD4876450E98EE2DCB4CF539DE6.taxon	etymology	Etymology. Spiniferum (Lat., adj.) – bearing spines.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
82452FD4876450E98EE2DCB4CF539DE6.taxon	description	Description. Basidiocarps effused, up to 3 cm in widest dimension, semitranslucent, gelatinous, whitish or greyish, adnate; hymenophore hydnoid, spines regularly arranged, acute, single or fasciculate, 0.1 – 0.6 mm long, 5 – 7 per mm; subiculum first watery greyish, semitranslucent, then whitish, opaque, 0.02 – 0.05 mm thick; margin gradually thinning-out. Hyphal structure monomitic, hyphae hyaline, clamped; subicular hyphae thin-walled, predominantly subparallel, 1 – 2 μm in diam., tramal hyphae subparallel, subhymenial hyphae ascending, very thin-walled, and quickly collapsing, (1.6 –) 1.9 – 3.0 (– 3.1) μm in diam. (n = 20 / 1). Acicular crystals quite rare, spread among hyphal tissues, often aggregated in large groups up to 20 μm in the widest dimension. Hyphidia occasionally present, simple to sparsely branched, 1 – 1.5 μm in diam. at the apical part, distributed among basidia. Basidia four-celled, longitudinally septate, broadly ellipsoid to subglobose, pedunculate, (6.0 –) 6.8 – 8.8 (– 9.2) × (5.3 –) 5.8 – 6.9 (– 7.0) μm (n = 20 / 1), partly glued together and often forming a continuous layer, stalk up to 8 × 2 μm, sterigmata up to 10 × 1.8 – 2.5 μm. Basidiospores cylindrical to broadly cylindrical, occasionally slightly curved, (4.1 –) 4.3 – 5.8 (– 5.9) × (2.3 –) 2.5 – 3.7 (– 3.8) μm (n = 90 / 3), L = 5.19 – 5.27, W = 2.98 – 3.13, Q’ = (1.4 –) 1.5 – 2.1 (– 2.2), Q = 1.70 – 1.75.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
82452FD4876450E98EE2DCB4CF539DE6.taxon	distribution	Distribution and ecology. North America (Canada – Alberta, USA – New York, Tennessee); strongly decomposed wood of angiosperms.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
0AB6EF1FAD63542B8FB31D233F518E4A.taxon	type_taxon	Type species. Myxarium nucleatum Wallr.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
7E097DA7C1AE559C8E55AEB9D2CA8E0C.taxon	description	Fig. 8 G	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
7E097DA7C1AE559C8E55AEB9D2CA8E0C.taxon	etymology	Etymology. Crispans (Lat., present participle of ‘ crispo’) – trembling, in reference to delicate consistence of basidiocarps.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
7E097DA7C1AE559C8E55AEB9D2CA8E0C.taxon	description	Description. Basidiocarps effused, up to 2 cm in widest dimension, semitranslucent, gelatinous, whitish, adnate; hymenophore hydnoid, spines acute, single, 0.1 – 0.3 mm long, 6 – 7 per mm; subiculum hardly visible, semitranslucent, 0.02 – 0.05 mm thick; margin gradually thinning-out. Hyphal structure monomitic, hyphae hyaline, clamped, frequently anastomosing; subicular hyphae thin- to slightly thick-walled, interwoven, 1 – 3 μm in diam., subhymenial hyphae thin-walled, quickly collapsing, interwoven, 1 – 3 μm in diam. Cystidia absent. Hyphidia abundant, richly branched, 1 – 2 μm in diam. at the apex, scattered among basidia or partly covering basidial cells. Basidia (two –) four-celled, longitudinally or obliquely septate, broadly ellipsoid to globose, pedunculate, (9.0 –) 9.2 – 11.9 (– 12.0) × (7.2 –) 7.3 – 9.1 (– 9.2) μm (n = 20 / 1), stalk distinct, up to 20 × 2 – 3.5 μm, sterigmata gradually tapering, rarely bifurcate, up to 15 × 2 – 3 μm. Basidiospores smooth, thin-walled, narrowly ellipsoid or broadly cylindrical (shorter spores) to cylindrical-subfusiform or somewhat rhomboid (longer spores), more rarely almost pyriform or lacrymoid, (5.2 –) 5.9 – 9.3 (– 10.2) × (3.3 –) 3.5 – 5.4 (– 5.8) μm (n = 30 / 1), L = 7.48, W = 4.61, Q’ = (1.3 –) 1.4 – 2.1 (– 2.2), Q = 1.64, with a large central oil drop.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
7E097DA7C1AE559C8E55AEB9D2CA8E0C.taxon	distribution	Distribution and ecology. Europe (Sweden); very rotten coniferous logs (Pinus).	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
11B898B4741C596CA3C83E4037109AAA.taxon	description	Figs 6 D, 8 H	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
11B898B4741C596CA3C83E4037109AAA.taxon	etymology	Etymology. Reliquus (Lat., adj.) – remaining, another one.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
11B898B4741C596CA3C83E4037109AAA.taxon	description	Description. Basidiocarps effused, covering a few cm, semitranslucent, gelatinous, whitish, adnate; hymenophore hydnoid, spines acute, single, 0.05 – 0.1 mm long, 6 – 8 per mm; subiculum hardly visible, semitranslucent, 0.02 – 0.05 mm thick; margin gradually thinning-out. Hyphal structure monomitic, hyphae hyaline, clamped, frequently anastomosing; subicular hyphae thin-walled or with a distinct wall, interwoven, 2.5 – 4 μm in diam., subhymenial hyphae very thin-walled, quickly collapsing, interwoven, 2 – 3 μm in diam. Cystidia absent. Hyphidia abundant, richly branched, 1 – 1.5 μm in diam. at the apex, scattered among basidia. Basidia four-celled, longitudinally septate, broadly ellipsoid to globose, pedunculate, (7.2 –) 7.6 – 9.6 (– 10.2) × (5.6 –) 6.0 – 7.3 (– 7.5) μm (n = 20 / 1), stalk distinct, up to 25 × 2 – 2.5 μm, sterigmata gradually tapering, up to 22 × 2 – 2.5 μm. Basidiospores smooth, thin-walled, narrowly ellipsoid or ovoid to broadly cylindrical, (5.1 –) 5.2 – 7.7 (– 8.1) × (3.2 –) 3.3 – 4.5 (– 4.8) μm (n = 31 / 1), L = 6.20, W = 3.89, Q’ = (1.2 –) 1.3 – 1.8 (– 1.9), Q = 1.60, with a large central oil drop.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
11B898B4741C596CA3C83E4037109AAA.taxon	distribution	Distribution and ecology. North America (USA – Tennessee); rotten coniferous logs (Juniperus spp.).	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
D70FAF61631A5680AAF2240F08191B97.taxon	type_taxon	Type species. Protoacia delicata Spirin & V. Malysheva.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
D70FAF61631A5680AAF2240F08191B97.taxon	discussion	The generic type of Protoacia, P. delicata, possesses broadly ellipsoid or subglobose basidiospores. Here we add two new species with ellipsoid to cylindrical basidiospores to Protoacia. However, we do not amend the generic description of Protoacia due to the somewhat uncertain status of the genus versus Gelacantha (see Results). The single species of that genus, G. pura, differs from the three Protoacia species in having more robust basidiocarps with irregularly distributed and partly fusing spines, as well as wider subicular hyphae and hyphidia. At least one more undescribed species closely related to P. delicata can be recognised based on available sequences in GenBank (Fig. 3).	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
A31B8E475927554190FCE2C82668E799.taxon	description	Figs 7 C, 11 A	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
A31B8E475927554190FCE2C82668E799.taxon	description	Description. Basidiocarps first orbicular or pulvinate, later cerebriform or foliaceous, gelatinous, opalescent, pure white to beige, later pale ochraceous to brownish, up to 3 cm in diam., 3 – 15 mm thick, in dry condition brown and tough, margin elevated, partly detaching; lobes rounded, entire, 1 – 1.5 mm thick. Hyphal structure monomitic, hyphae hyaline, clamped, thin- to slightly thick-walled; context hyphae mostly interwoven, frequently anastomosing, 2 – 7 μm in diam., occasionally swollen at septa (up to 9 μm in diam.), embedded in gelatinous matrix, subhymenial hyphae predominantly ascending, rather loosely arranged, 1 – 3 μm in diam. Gloeocystidia abundant, yellowish or brownish, gradually tapering to the apex, more rarely narrowly clavate, occasionally bifurcate, embedded, (69 –) 76 – 260 (– 265) × (4.1 –) 5.0 – 11.4 (– 13.2) μm (n = 42 / 4). Hyphidia abundant, richly branched, 0.5 – 2 μm in diam. at the apex, occasionally forming a continuous layer up to 20 μm thick. Basidia four-celled, longitudinally septate, ovoid-ellipsoid, sessile or very rarely with a strongly reduced stalk-like base (up to 2.5 × 2.5 μm), embedded, (12 –) 13 – 17.5 (– 18) × (8.8 –) 9.1 – 13.5 (– 13.7) μm (n = 40 / 4), sterigmata gradually tapering, up to 15 × 2 – 3 μm. Basidiospores smooth, thin-walled, cylindrical to broadly cylindrical, often slightly curved, (7.3 –) 7.6 – 11.2 (– 12.2) × (3.8 –) 3.9 – 6.1 (– 6.2) μm (n = 120 / 4), L = 9.37 – 10.14, W = 4.63 – 5.54, Q’ = (1.5 –) 1.6 – 2.3 (– 2.4), Q = 1.72 – 2.04.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
A31B8E475927554190FCE2C82668E799.taxon	distribution	Distribution and ecology. North America (USA – the eastern states); wood of angiosperms.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
6FAF8ACEB0B15F40BC075453B0DCE41F.taxon	description	Fig. 11 B	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
6FAF8ACEB0B15F40BC075453B0DCE41F.taxon	description	Description. Basidiocarps first pustulate, gregarious, up to 1.5 mm in diam., then adpressed-cerebriform, up to 4 mm in diam., finally fusing together and forming compound crust-like fructifications up to 1 cm in the widest dimension, gelatinous, semitranslucent, amber-yellowish to pale ochraceous, 0.5 – 1 mm thick, in dry condition almost invisible, margin elevated, partly detaching; lobes poorly differentiated, rounded, entire, up to 0.5 mm thick. Hyphal structure monomitic, hyphae clamped; context hyphae thin- to slightly thick-walled, predominantly interwoven, hyaline or brownish, 1 – 4 μm in diam., embedded in gelatinous matrix, subhymenial hyphae thin-walled, ascending, hyaline, 1.5 – 3 μm in diam. Gloeocystidia abundant to rather rare, hyaline to yellowish, as a rule gradually tapering to the apex, embedded or rarely slightly projecting, 44 – 85 × 4.3 – 8.9 μm (n = 10 / 1). Hyphidia abundant, simple or sparsely branched, 0.5 – 1 μm in diam. at the apex, forming a continuous layer up to 10 μm thick. Basidia four-celled, longitudinally septate, ovoid-ellipsoid, sessile, embedded, 18 – 24 × 9.7 – 13.5 μm (n = 10 / 1), sterigmata gradually tapering, up to 15 × 2 – 3 μm. Basidiospores smooth, thin-walled, cylindrical to broadly cylindrical, occasionally slightly curved, (10.0 –) 10.2 – 14.6 (– 15.4) × 5.5 – 7.2 (– 7.4) μm (n = 20 / 1), L = 12.84, W = 6.46, Q’ = (1.6 –) 1.7 – 2.5 (– 2.7), Q = 2.00.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
F5C0337F7ACD5BD29B51E072BB63FA59.taxon	description	Fig. 11 C	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
F5C0337F7ACD5BD29B51E072BB63FA59.taxon	description	Description. Basidiocarps effused, up to 3 cm in widest dimension, smooth or indistinctly tuberculate, gelatinous, opaque, dirty ochraceous to brownish, 0.1 – 0.2 mm thick, in dry condition almost invisible, margin sharply delimited, adnate. Hyphal structure monomitic, hyphae hyaline, clamped; subicular hyphae thin- to slightly thick-walled, interwoven or subparallel, hardly discernible, 1.5 – 3.5 μm in diam., subhymenial hyphae thin-walled, ascending or interwoven, easily collapsing, 1.5 – 3 μm in diam. Gloeocystidia abundant, hyaline to yellowish, tubular-clavate, sometimes gradually tapering to the apex, embedded, (35 –) 36 – 92 (– 102) × (5.0 –) 5.1 – 8.7 (– 8.8) μm (n = 14 / 1). Hyphidia abundant, variably branched, 1 – 1.5 μm in diam. at the apex, forming a continuous layer up to 10 μm thick. Basidia four-celled, longitudinally septate, ovoid-ellipsoid, pedunculate, 14.5 – 21 × 9.4 – 15.2 μm (n = 8 / 1), stalk up to 15 × 3.5 – 4 μm, sterigmata gradually tapering, up to 16 × 3 – 3.5 μm. Basidiospores smooth, thin-walled, broadly cylindrical to narrowly ovoid, slightly to moderately curved, (7.4 –) 7.8 – 11.0 (– 11.1) × (4.3 –) 4.6 – 5.8 (– 6.2) μm (n = 30 / 1), L = 9.10, W = 5.21, Q’ = (1.4 –) 1.5 – 1.9 (– 2.0), Q = 1.75.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
26668B3C8B935EEEB5BD6733C0350D26.taxon	description	Fig. 11 D	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
26668B3C8B935EEEB5BD6733C0350D26.taxon	etymology	Etymology. Elevatus (Lat., adj.) – elevated; referred to the basidiocarp margin.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
26668B3C8B935EEEB5BD6733C0350D26.taxon	description	Description. Basidiocarps adpressed-orbicular to cerebriform, erumpent, up to 0.5 cm in diam., first solitary, then partly fusing together, gelatinous, semitranslucent, ivory-yellowish or pale ochraceous, up to 1 mm thick, in dry condition brownish and crustaceous, margin elevated, adnate; lobes poorly pronounced, rounded, entire, 0.5 – 1 mm thick. Hyphal structure monomitic, hyphae hyaline, clamped, thin-walled, easily collapsing; context hyphae interwoven, 2.5 – 5 μm in diam., embedded in gelatinous matrix, subhymenial hyphae ascending or interwoven, rather loosely arranged, 2 – 4 μm in diam. Gloeocystidia abundant, hyaline to yellowish, often distinctly tapering to the apex, embedded, (23 –) 26 – 46 (– 51) × (5.2 –) 5.3 – 7.8 (– 8.1) μm (n = 20 / 1). Hyphidia abundant, richly branched, 1 – 1.5 μm in diam. at the apex, forming a continuous, loose layer up to 15 μm thick. Basidia four-celled, longitudinally septate, ovoid-ellipsoid, sessile, often distinctly tapering to the base, embedded, (18 –) 24 – 34 (– 40) × (11.8 –) 12.0 – 15.9 (– 16.7) μm (n = 20 / 1), sterigmata gradually tapering, up to 25 × 4 – 6 μm. Basidiospores smooth, thin-walled, ellipsoid-ovoid to broadly cylindrical, more rarely cylindrical and slightly curved, (11.0 –) 11.8 – 15.7 (– 16.2) × (7.4 –) 7.8 – 10.1 (– 11.1) μm (n = 30 / 1), L = 13.16, W = 8.91, Q’ = (1.2 –) 1.3 – 1.7 (– 1.8), Q = 1.49.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
26668B3C8B935EEEB5BD6733C0350D26.taxon	distribution	Distribution and ecology. East Asia (Russia – Kuril Ids.); dead angiosperm wood.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
EDF0EC7397795ACD82FF2BD18CE59D38.taxon	description	Figs 6 E, 11 E	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
EDF0EC7397795ACD82FF2BD18CE59D38.taxon	etymology	Etymology. Erumpens (Lat., present participle of ‘ erumpo’) – erumpent, in reference to the basidiocarp’s growth.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
EDF0EC7397795ACD82FF2BD18CE59D38.taxon	description	Description. Basidiocarps effused, up to 3 cm in widest dimension, erumpent, smooth, gelatinous, semitranslucent, bluish-greyish to pale ochraceous, 0.04 – 0.1 mm thick, in dry condition almost invisible, margin gradually thinning-out. Hyphal structure monomitic, hyphae hyaline or yellowish, clamped; subicular hyphae slightly thick-walled, subparallel, frequently anastomosing, 2 – 3 μm in diam., subhymenial hyphae thin- to slightly thick-walled, interwoven or ascending, rather loosely arranged, 2 – 4 μm in diam. Cystidia absent. Hyphidia abundant, richly branched, 0.5 – 1 μm in diam. at the apex, occasionally forming a continuous layer up to 15 μm thick. Basidia four-celled, longitudinally septate, ovoid-ellipsoid, pedunculate, (12 –) 13 – 16.5 (– 17) × (9.0 –) 9.2 – 11.2 (– 11.3) μm (n = 20 / 1), stalk up to 14 × 3 – 4.5 μm, sometimes strongly reduced, sterigmata gradually tapering, up to 20 × 2 – 3 μm. Basidiospores smooth, thin-walled, cylindrical to broadly cylindrical, slightly to moderately curved, (8.9 –) 9.3 – 12.3 (– 13.4) × (5.0 –) 5.1 – 6.4 (– 6.8) μm (n = 30 / 1), L = 11.12, W = 5.78, Q’ = (1.6 –) 1.7 – 2.2 (– 2.3), Q = 1.93.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
EDF0EC7397795ACD82FF2BD18CE59D38.taxon	distribution	Distribution and ecology. Africa (Kenya); partly corticated fallen angiosperm branch.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
A07DABD029E751A8A81F3B5F219098D6.taxon	description	Figs 7 D, 11 F	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
A07DABD029E751A8A81F3B5F219098D6.taxon	description	Description. Basidiocarps effused, covering a few cm, smooth or indistinctly tuberculate, gelatinous, first semitranslucent, bluish-greyish, then opalescent, whitish, 0.1 – 1 mm thick, in dry condition vinaceous-brown to brownish-black, vernicose, margin gradually thinning-out. Hyphal structure monomitic, hyphae hyaline or yellowish, clamped; subicular hyphae thin-walled, subparallel, 3 – 4 μm in diam., subhymenial hyphae thin-walled, interwoven or ascending, rather densely arranged, 1.5 – 3.5 μm in diam. Gloeocystidia abundant, brownish-yellowish, deeply rooted, usually tapering to the apex, often sinuous, embedded, (68 –) 70 – 109 (– 118) × (4.1 –) 4.2 – 7.2 (– 8.6) μm (n = 30 / 3). Hyphidia abundant, richly branched, 1 – 1.5 μm in diam. at the apex, forming a continuous layer up to 20 μm thick. Basidia four-celled, longitudinally or occasionally obliquely septate, ovoid-ellipsoid, pedunculate, (12 –) 13 – 20 (– 23.5) × (8.7 –) 8.9 – 13.1 (– 14.0) μm (n = 41 / 4), stalk up to 16 × 2.5 – 3 μm, sterigmata tubular, gradually tapering, up to 20 × 2 – 3.5 μm. Basidiospores smooth, thin-walled, ellipsoid-ovoid to broadly cylindrical, the longest spores slightly curved, (8.1 –) 8.3 – 12.3 (– 12.8) × (5.0 –) 5.1 – 7.3 (– 7.4) μm (n = 180 / 6), L = 9.32 – 11.26, W = 6.23 – 6.48, Q’ = (1.2 –) 1.3 – 2.0 (– 2.3), Q = 1.49 – 1.75.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
A07DABD029E751A8A81F3B5F219098D6.taxon	distribution	Distribution and ecology. Europe (Austria, France, Germany, Italy, Portugal, Russia, Spain, and Ukraine), Macaronesia (Canary Islands), and Asia (Iran); decorticated wood of deciduous trees, rarely conifers.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
1F7E12E872A55499BD2E81DAB1C16996.taxon	description	Description. Basidiocarps effused, covering a few cm, smooth, gelatinised, semitranslucent, dirty ochraceous to brownish, 0.1 – 0.2 mm thick, margin gradually thinning-out. Hyphal structure monomitic, hyphae hyaline, clamped; subicular hyphae indiscernible, subhymenial hyphae thin-walled, ascending, easily collapsing, 2.5 – 3.5 μm in diam. Gloeocystidia yellowish, tapering, embedded, 41 – 69 × 6.5 – 12 μm. Hyphidia abundant, richly branched, 1 – 1.5 μm in diam. at the apex, forming a continuous layer up to 20 μm thick. Basidia four-celled, longitudinally septate, ovoid-ellipsoid, pedunculate, 14.5 – 18 × 9.1 – 12.8 μm (n = 6 / 1), stalk up to 17 × 3 – 3.5 μm, sometimes strongly reduced, sterigmata gradually tapering, up to 12.5 × 3 μm. Basidiospores smooth, thin-walled, broadly ellipsoid to subglobose, 8.0 – 10.2 × 6.7 – 7.9 μm (n = 3 / 1), widely collapsed.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
A16CEE29384B5E26A9115CA839917D31.taxon	description	Figs 10 A, 11 G	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
A16CEE29384B5E26A9115CA839917D31.taxon	description	Description. Basidiocarps first adpressed-orbicular, up to 1 cm in diam., gelatinous, semitranslucent, pale ochraceous or greyish to brownish, 1 – 2 mm thick, then fusing together and forming compound effused basidiocarps up to 5 cm in diam., in dry condition brown and rather tough, margin adnate or partly detaching. Hyphal structure monomitic, hyphae hyaline, clamped; context hyphae thin-walled, interwoven or subparallel, anastomosing, embedded in gelatinous matrix, 2 – 4 μm in diam., subhymenial hyphae thin-walled, ascending or interwoven, 1.5 – 3 μm in diam. Gloeocystidia abundant, hyaline to yellowish or brownish, tapering or more rarely tubular-clavate, embedded or only slightly projecting (up to 10 μm) above hymenial layer, 48 – 112 × 5 – 11 μm. Hyphidia abundant, richly branched, 1 – 2 μm in diam. at the apex, forming a continuous layer up to 25 μm thick. Basidia four-celled, longitudinally septate, ovoid-ellipsoid, sessile or rarely with a reduced stalk up to 4 × 3 μm, (18 –) 19 – 26.5 (– 29) × (10.8 –) 11.7 – 16.0 (– 18.0) μm (n = 30 / 3), sterigmata gradually tapering, up to 20 × 3.5 – 4 μm. Basidiospores smooth, thin-walled, cylindrical to broadly cylindrical, occasionally slightly curved, (9.4 –) 9.9 – 15.6 (– 16.8) × (5.8 –) 5.9 – 8.3 (– 8.9) μm (n = 90 / 3), L = 13.05 – 14.04, W = 6.77 – 7.33, Q’ = (1.4 –) 1.5 – 2.4 (– 2.5), Q = 1.78 – 1.99.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
A16CEE29384B5E26A9115CA839917D31.taxon	distribution	Distribution and ecology. North America (USA – California, the Caribbean – Grenada); decayed angiosperm wood.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
EFE660F7E8205B45B1E1448D44B06055.taxon	description	Figs 6 F, 10 B, 11 H	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
EFE660F7E8205B45B1E1448D44B06055.taxon	description	Description. Basidiocarps effused, covering a few cm, smooth or indistinctly tuberculate, gelatinous, first semitranslucent, whitish-greyish or cream-coloured, then greyish- to reddish-brown, opalescent, 0.02 – 1 mm thick, in dry condition almost invisible or turning to a vinaceous-brown vernicose crust, margin rather sharply delimited, adnate. Hyphal structure monomitic, hyphae hyaline or yellowish, clamped; subicular hyphae thin- to slightly thick-walled, interwoven or subparallel, frequently anastomosing, 2 – 4 μm in diam., subhymenial hyphae thin- to slightly thick-walled, interwoven or ascending, rather densely arranged and partly glued together, 1 – 3.5 μm in diam. Cystidia absent. Hyphidia abundant, richly branched, 0.5 – 2 μm in diam. at the apex, usually forming a continuous layer up to 20 μm thick. Basidia four-celled, longitudinally or rarely obliquely septate, ovoid-ellipsoid, pedunculate, (13 –) 14 – 20 (– 22) × (9.7 –) 9.8 – 14.3 (– 14.5) μm (n = 72 / 7), stalk up to 15 × 2 – 4 μm, sometimes strongly reduced, sterigmata tubular, gradually tapering, up to 20 × 2 – 3.5 μm. Basidiospores smooth, thin-walled, cylindrical to broadly cylindrical, often slightly curved, (9.1 –) 9.2 – 15.8 (– 15.9) × (4.7 –) 5.0 – 7.2 (– 7.3) μm (n = 240 / 8), L = 11.34 – 13.65, W = 5.71 – 6.46, Q’ = (1.6 –) 1.7 – 2.6 (– 2.8), Q = 1.85 – 2.23.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
EFE660F7E8205B45B1E1448D44B06055.taxon	distribution	Distribution and ecology. Europe (Austria, France, Greece, Italy, Romania, Slovenia, Spain, and Ukraine); rotten decorticated wood of conifers (Abies, Pinus).	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
2111718ECF205318814A2567A9C2901E.taxon	description	Fig. 11 I	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
2111718ECF205318814A2567A9C2901E.taxon	description	Description. Basidiocarps cushion-shaped, gregarious, erumpent, ca. 1 mm in diam., gelatinous, semitranslucent, amber-coloured, up to 0.5 mm thick, in dry condition reddish-brown. Hyphal structure monomitic, hyphae hyaline, clamped, thin- or moderately thick-walled, ascending, 1.5 – 2.5 μm in diam., context hyphae not differentiated. Gloeocystidia abundant, hyaline or brownish, gradually tapering to the apex, embedded or slightly projecting, 32 – 83 × 4.7 – 9.9 μm (n = 10 / 1). Hyphidia abundant, richly branched, 1 – 1.5 μm in diam. at the apex, forming a continuous layer up to 20 μm thick. Basidia four-celled, longitudinally septate, ovoid-ellipsoid, sessile, embedded, 15 – 23.5 × 9.8 – 14.2 μm (n = 12 / 1), sterigmata gradually tapering, up to 20 × 2.5 – 3 μm. Basidiospores smooth, thin-walled, cylindrical, slightly or distinctly curved, (9.8 –) 10.3 – 15.3 (– 15.8) × (4.5 –) 4.6 – 6.5 (– 6.6) μm (n = 30 / 1), L = 13.31, W = 5.62, Q’ = (1.8 –) 1.9 – 2.8 (– 3.3), Q = 2.39.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
86F0FCDED8DB5F3192944514BD496E06.taxon	description	Description. Basidiocarps cushion-shaped – cerebriform or completely resupinate, with adnate or elevated margin, gelatinous; hymenial surface nearly smooth or (in one species) distinctly hydnoid. Hyphal structure monomitic, hyphae clamped. Gloeocystidia present in most species, tubular, variably tapering upwards, usually embedded. Basidia strictly four-celled, sessile (cerebriform species) or predominantly pedunculate to petiolate (resupinate species), with rather thick, distinctly located sterigmata. Basidiospores thin-walled, cylindrical to ellipsoid, more rarely cylindrical-subfusiform or broadly ellipsoid – subglobose, repetitive.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
86F0FCDED8DB5F3192944514BD496E06.taxon	type_taxon	Type species. Protohydnum cartilagineum Möller.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
86F0FCDED8DB5F3192944514BD496E06.taxon	discussion	Here we redefine Protohydnum and merge it with Ductifera and Bourdotia. Additionally, two species earlier included in Exidiopsis (Bref.) Möller s. lato (i. e., Exidiopsis glabra Möller and E. livescens) are also reclassified into Protohydnum. In its current scope, the genus contains sixteen species. Phylogenetically, the large Protohydnum clade is the sister lineage of Basidiodendron Rick (Weiß and Oberwinkler 2001, Spirin et al. 2020, 2021, present study – Fig. 1). All Basidiodendron spp. have gloeocystidia similar to those of the cystidiate Protohydnum species. However, the genera are quite different otherwise. Basidiocarps of Basidiodendron spp. are waxy-arid (not gelatinous as in Protohydnum), and they become somewhat gelatinised at the very end of their development in only a few species. Furthermore, turgid basidia of Basidiodendron spp. are usually located at the very top of the basidia-bearing hyphae covered by remnants of already collapsed basidial cells, giving these structures a peculiar “ fishbone ” - like appearance; no such structures have been observed in Protohydnum spp. Moreover, basidiospores of Basidiodendron spp. feature a large, often asymmetrical, and somewhat eccentric apiculus (at least in the core species of the genus, i. e. those from the Basidiodendron eyrei (Wakef.) Luck-Allen and Basidiodendron caesiocinereum (Höhn. & Litsch.) Luck-Allen complexes) (Spirin et al. 2020, 2021). In contrast, the basidiospore apiculus in Protohydnum spp. is, as a rule, rather small, regularly outlined, and conventionally located.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
8733A9A17E9F5169AD0B4BE93C90A0BF.taxon	description	Fig. 11 J	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
8733A9A17E9F5169AD0B4BE93C90A0BF.taxon	etymology	Etymology. Nudus (Lat., adj.) – nude; in reference to exposed basidia.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
8733A9A17E9F5169AD0B4BE93C90A0BF.taxon	description	Description. Basidiocarps effused, up to 4 cm in widest dimension, smooth, gelatinous, semitranslucent, bluish-greyish to brownish, 0.1 – 0.2 mm thick, in dry condition light grey and rather sturdy, opaque, margin gradually thinning-out. Hyphal structure monomitic, hyphae hyaline, clamped; subicular hyphae thin-walled or with variably thickened gelatinised walls, subparallel or interwoven, glued together, 2.5 – 4 μm in diam., subhymenial hyphae thin-walled, predominantly ascending, often glued, 2 – 4 μm in diam. Gloeocystidia abundant, hyaline to yellowish, deeply rooted or arising from subhymenial hyphae, slightly tapering to the apex, often sinuous, normally embedded, 30 – 154 × 3.5 – 6.5 μm. Hyphidia abundant, richly branched, 0.5 – 1 μm in diam. at the apex, normally scattered among basidia, in senescent hymenium sometimes forming a continuous layer up to 10 μm thick. Basidia four-celled, longitudinally septate, ovoid-ellipsoid, pedunculate, (17 –) 17.5 – 23 (– 24) × (10.2 –) 10.3 – 12.4 (– 12.8) μm (n = 20 / 2), often exposed, stalk up to 20 × 3.5 – 6 (– 8) μm, sterigmata tubular, gradually tapering, up to 18 × 2 – 3.5 μm. Basidiospores smooth, thin-walled, ellipsoid-ovoid to broadly ellipsoid or more rarely subglobose, (7.2 –) 7.3 – 10.2 (– 10.6) × (5.7 –) 6.2 – 8.9 (– 9.0) μm (n = 60 / 2), L = 8.65 – 9.29, W = 6.86 – 7.91, Q’ = 1.1 – 1.4 (– 1.5), Q = 1.18 – 1.26, apiculus occasionally eccentric.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
8733A9A17E9F5169AD0B4BE93C90A0BF.taxon	distribution	Distribution and ecology. Africa (Kenya); decorticated wood of deciduous trees.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
1C5E0FE19DC55834A6F82994885C7EA2.taxon	description	Fig. 11 K	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
1C5E0FE19DC55834A6F82994885C7EA2.taxon	etymology	Etymology. Ocellatus (Lat., adj.) – ocellate; in reference to abundant mineral inclusions.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
1C5E0FE19DC55834A6F82994885C7EA2.taxon	description	Description. Basidiocarps effused, up to 10 cm in widest dimension, tuberculate, gelatinous, semitranslucent, amber-yellow to ochraceous-reddish, 0.5 – 1 mm thick, containing numerous small whitish grains, in dry condition vinaceous-brown, vernicose, margin sharply delimited, adnate or partly detaching. Hyphal structure monomitic, hyphae hyaline, clamped, thin-walled, homogeneous throughout, ascending, rather tightly arranged, 3 – 5 μm in diam. Cystidia absent. Hyphidia abundant, richly branched, 1 – 1.5 μm in diam. at the apex, usually forming a continuous layer up to 15 μm thick. Basidia four-celled, longitudinally septate, ovoid-ellipsoid, pedunculate, (12 –) 13 – 14.5 (– 15) × (8.2 –) 8.8 – 11.1 (– 11.3) μm (n = 20 / 1), stalk up to 30 × 3 – 5 μm, sterigmata gradually tapering, up to 12 × 3 – 4 μm. Basidiospores smooth, thin-walled, cylindrical to subfusiform, (7.7 –) 7.9 – 10.2 (– 10.3) × (3.1 –) 3.6 – 4.8 (– 4.9) μm (n = 30 / 1), L = 8.91, W = 4.07, Q’ = (1.8 –) 1.9 – 2.6 (– 2.7), Q = 2.20, cytoplasm usually aguttulate.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
1C5E0FE19DC55834A6F82994885C7EA2.taxon	distribution	Distribution and ecology. South America (Brazil); decayed angiosperm wood.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
4DBA027E7AEE5AE1AA84011F92ABCD07.taxon	description	Figs 10 C, 11 L	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
4DBA027E7AEE5AE1AA84011F92ABCD07.taxon	etymology	Etymology. Pallidus (Lat., adj.) – pale, in reference to pale-coloured basidiocarps.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
4DBA027E7AEE5AE1AA84011F92ABCD07.taxon	description	Description. Basidiocarps effused, erumpent, up to 6 cm in widest dimension, smooth or indistinctly folded, cartilagineous, opaque, cream-coloured to pale ochraceous, 1 – 1.5 mm thick, in dry condition brown, vernicose, margin sharply delimited, sometimes slightly elevated, adnate or partly detaching. Hyphal structure monomitic, hyphae hyaline, clamped, homogeneous throughout, ascending or interwoven, embedded in gelatinous matrix, 2 – 3 μm in diam. Gloeocystidia abundant, yellowish-brownish, tapering or tubular-clavate, embedded, 85 – 165 × 9.5 – 17 μm. Hyphidia abundant, richly branched, 1.5 – 2 μm in diam. at the apex, forming a continuous layer up to 15 μm thick. Basidia four-celled, longitudinally septate, ovoid-ellipsoid, pedunculate, (22 –) 23 – 31 (– 32) × (14.2 –) 14.4 – 19.8 (– 20.2) μm (n = 20 / 1), stalk up to 22 × 4 – 5.5 μm, sterigmata gradually tapering or apically swollen, up to 17 × 6 – 7 μm. Basidiospores smooth, thin-walled, ellipsoid to broadly ellipsoid, (14.0 –) 14.7 – 17.1 (– 17.2) × (10.1 –) 10.2 – 13.0 (– 13.1) μm (n = 30 / 1), L = 15.77, W = 11.58, Q’ = (1.1 –) 1.2 – 1.5 (– 1.7), Q = 1.37, cytoplasm with one or several large oil drops.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
4DBA027E7AEE5AE1AA84011F92ABCD07.taxon	distribution	Distribution and ecology. Africa (Zimbabwe); still corticated angiosperm branches.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
6EA1EFD6FC47577BB908A32C67959AA1.taxon	description	Fig. 11 M	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
6EA1EFD6FC47577BB908A32C67959AA1.taxon	description	Description. Basidiocarps first pustulate, gregarious, ca. 1 mm in diam., then adpressed-orbicular, up to 1 cm in diam., finally fusing together and forming compound crust-like, effused fructifications up to 2 cm in the widest dimension, gelatinous, semitranslucent, cream-coloured to ivory-yellowish or pale ochraceous, 1 – 2 mm thick, in dry condition brown and crustaceous, margin elevated, partly detaching; lobes rounded or evenly incised, hollow, 0.5 – 1 mm thick. Hyphal structure monomitic, hyphae hyaline, clamped, thin- to slightly thick-walled; context hyphae interwoven or subparallel, 2 – 6.5 μm in diam., embedded in gelatinous matrix, subhymenial hyphae predominantly ascending, rather tightly arranged, 1 – 3 μm in diam. Gloeocystidia abundant to rather rare, hyaline to yellowish or brownish, gradually tapering to the apex, embedded, (55 –) 65 – 122 (– 172) × (5.0 –) 5.8 – 11.4 (– 12.3) μm (n = 24 / 3). Hyphidia abundant, richly branched, 0.5 – 1.5 μm in diam. at the apex, forming a continuous layer up to 30 μm thick. Basidia four-celled, longitudinally septate, ovoid-ellipsoid, sessile, embedded, (12 –) 13.5 – 17.5 (– 18.5) × (8.9 –) 9.8 – 13.6 (– 13.8) μm (n = 24 / 3), sterigmata gradually tapering, up to 15 × 2 – 3 μm. Basidiospores smooth, thin-walled, cylindrical to broadly cylindrical, usually slightly curved, (8.4 –) 8.8 – 11.8 (– 12.3) × (4.0 –) 4.2 – 6.5 (– 6.6) μm (n = 90 / 3), L = 10.02 – 10.34, W = 5.36 – 5.56, Q’ = (1.5 –) 1.6 – 2.3 (– 2.8), Q = 1.85 – 1.93.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
6EA1EFD6FC47577BB908A32C67959AA1.taxon	distribution	Distribution and ecology. South America (Ecuador); thin fallen branches of angiosperms.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
9C0FD7C018CC53158C2FD9F7473284FC.taxon	description	Figs 10 D, 11 N	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
9C0FD7C018CC53158C2FD9F7473284FC.taxon	description	Description. Basidiocarps pulvinate or cerebriform, up to 1 cm in diam., occasionally fusing together and producing compound fructifications up to 4 cm in widest dimension, gelatinous, semitranslucent, pale ochraceous or amber-coloured to brownish-orange, 1.5 – 8 mm thick, in dry condition brown and tough, margin elevated, partly detaching; lobes rounded, blunt, entire, up to 1.5 mm thick. Hyphal structure monomitic, hyphae hyaline or yellowish, clamped, thin-walled or with a distinct wall; context hyphae predominantly interwoven, 1 – 3 μm in diam., occasionally inflated up to 6 μm in diam., embedded in gelatinous matrix, subhymenial hyphae ascending, rather loosely arranged, 1 – 3 μm in diam. Gloeocystidia abundant, brownish, distinctly tapering at the apex, sometimes subulate, embedded or variably projecting, (75 –) 80 – 248 (– 272) × (4.0 –) 4.2 – 10.6 (– 11.1) μm (n = 30 / 4). Hyphidia hyaline to brownish, richly branched, 0.5 – 1 μm in diam. at the apex, forming a continuous layer up to 50 μm thick. Basidia four-celled, longitudinally or obliquely septate, ovoid-ellipsoid, sessile or rarely with a strongly reduced stalk up to 4 × 3 μm, (11.5 –) 12 – 16.5 (– 17) × (7.8 –) 8.1 – 12.4 (– 13.7) μm (n = 40 / 4), sterigmata gradually tapering, up to 30 × 3 – 4 μm. Basidiospores smooth, thin-walled, cylindrical to broadly cylindrical, usually slightly curved (bean-shaped), (8.3 –) 8.8 – 11.0 (– 11.1) × (4.7 –) 4.8 – 6.1 (– 6.3) μm (n = 120 / 4), L = 9.99 – 10.75, W = 5.23 – 5.53, Q’ = (1.5 –) 1.6 – 2.4 (– 2.6), Q = 1.83 – 1.99.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
9C0FD7C018CC53158C2FD9F7473284FC.taxon	distribution	Distribution and ecology. South America (southern part of Brazil); decayed wood of angiosperms.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
A2CB0041CBD950CDBFE414E9B5587EDF.taxon	description	Figs 6 G, 11 O	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
A2CB0041CBD950CDBFE414E9B5587EDF.taxon	etymology	Etymology. From Amiliavum, the Roman name of Millau (the type locality).	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
A2CB0041CBD950CDBFE414E9B5587EDF.taxon	description	Description. Basidiocarps effused, smooth, waxy, greyish to greyish-ochraceous, continuous, in older parts light-brown and partly gelatinised, up to 5 cm in widest dimension, 0.1 – 0.2 mm thick, margin narrow, first whitish to cream-coloured, floccose, then more compact and more or less concolourous with the hymenial surface. Hyphal structure monomitic; hyphae clamped, subicular hyphae with a distinct wall to slightly thick-walled, interwoven to subparallel, 1 – 3 μm in diam., subhymenial hyphae thin-walled, interwoven or ascending, 1 – 2 μm in diam., partly glued together. Tramal cystidia abundant, hyaline or brownish, tubular-clavate, sturdy, arising from slightly thick-walled, narrow hyphae, with moderately thickened (up to 1.5 μm) walls gradually thinning-out towards the apical part, longest cystidia slightly tapering to or widened at the apex (thin-walled apical parts sometimes collapsing), (32 –) 35 – 103 (– 119) × (2.8 –) 3.3 – 5.2 (– 5.3) μm (n = 42 / 2), often in groups of 5 – 15. Hyphidia present, simple or sparsely branched, 1 – 1.5 μm in diam. at the apex. Crystals present, acicular or in stellate agglomerations, up to 15 μm in widest dimension. Basidia four-celled, longitudinally septate, ovoid-ellipsoid to subglobose, pedunculate, (7.8 –) 8.2 – 11.2 (– 11.8) × (6.4 –) 7.1 – 8.8 (– 9.0) μm (n = 40 / 2), partly glued together, stalk distinct, up to 5 × 2.5 μm, sterigmata up to 10 × 2 μm. Basidiospores ellipsoid to broadly ellipsoid, more rarely broadly cylindrical, the longest spores somewhat sigmoid, (5.9 –) 6.0 – 9.1 (– 9.4) × (3.5 –) 3.7 – 5.1 (– 5.2) μm (n = 62 / 2), L = 7.30 – 7.59, W = 4.25 – 4.39, Q’ = (1.3 –) 1.4 – 2.1 (– 2.3), Q = 1.67 – 1.80.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
A2CB0041CBD950CDBFE414E9B5587EDF.taxon	distribution	Distribution and ecology. Europe (France); decayed angiosperm wood (Quercus).	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
C547F742F3DB5D618131A8C61CCC0C13.taxon	description	Description. Basidiocarps effused, smooth, first pruinose-reticulate, waxy, semitranslucent, greyish, then continuous, gelatinised, greyish or brownish when old or dry, up to 2 cm in widest dimension, 0.05 – 0.1 mm thick, margin concolourous with hymenium, gradually thinning-out. Hyphal structure monomitic; hyphae clamped, subicular hyphae with a distinct wall, subparallel and densely packed, 1 – 2.5 μm in diam., subhymenial hyphae thin-walled, interwoven or ascending, 1.5 – 3 μm in diam., often short-celled, glued together. Tramal cystidia abundant, hyaline or brownish, tubular-clavate, sturdy, arising from thin-walled hyphae, with thickened (up to 3.5 μm) walls gradually thinning-out towards the apical part, the longest cystidia slightly tapering to or widened at the apex (thin-walled apical parts often collapsing), (54 –) 57 – 149 (– 154) × (4.2 –) 4.6 – 9.4 (– 11.3) μm (n = 101 / 5), single or more often in groups of 2 – 8, sometimes biradicate, some cystidia tortuous; hymenial cystidia hyaline, broadly clavate to subglobose, thin- or slightly thick-walled, 10 – 50 × 4 – 13.5 μm, scattered among basidia, more rarely associated with tramal cystidia. Hyphidia present, simple or sparsely branched, 1 – 1.5 μm in diam. at the apex. Crystals occasionally present on hyphidia and cystidia, acicular or fused in stellate agglomerations. Basidia four-celled, longitudinally septate, ovoid-ellipsoid to subglobose, pedunculate, (6.8 –) 7.1 – 9.1 (– 9.4) × (5.9 –) 6.2 – 7.8 (– 8.2) μm (n = 30 / 3), spaced or partly glued together, stalk distinct, up to 6 × 2.5 μm, sterigmata up to 8 × 2 – 2.5 μm. Basidiospores smooth, thin-walled, ellipsoid to broadly cylindrical, more rarely lacrymoid, (4.1 –) 4.4 – 6.8 (– 7.1) × (3.0 –) 3.2 – 4.3 (– 4.4) μm (n = 180 / 6), L = 5.24 – 5.95, W = 3.45 – 3.85, Q’ = (1.2 –) 1.3 – 1.7 (– 1.9), Q = 1.47 – 1.61.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
C547F742F3DB5D618131A8C61CCC0C13.taxon	distribution	Distribution and ecology. Europe (France, Italy, Norway, Sweden, and Switzerland – basidiocarps on wood; Czech Republic, Estonia, Germany, and United Kingdom – soil sequences); strongly decayed wood of deciduous trees (Carpinus, Fraxinus, Quercus, and Ulmus).	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
1A9105D9F5B1581398AD77AFD713199A.taxon	description	Figs 6 H, 11 P	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
1A9105D9F5B1581398AD77AFD713199A.taxon	etymology	Etymology. Deceptorius (Lat., adj.) – deceptive, in reference to small morphological differences from the closely related species.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
1A9105D9F5B1581398AD77AFD713199A.taxon	description	Description. Basidiocarps effused, smooth, first pruinose-reticulate, waxy, semitranslucent, greyish, then continuous, gelatinised, up to 1 cm in widest dimension, 0.03 – 0.07 mm thick, margin concolourous with hymenium, gradually thinning-out; tiny white spots often present in mature basidiocarps, irregularly distributed on hymenial surface. Hyphal structure monomitic; hyphae clamped, subicular hyphae with a distinct wall, subparallel, 2 – 3 μm in diam., subhymenial hyphae thin-walled or with a distinct wall, interwoven or ascending, 1.5 – 2.5 μm in diam., glued together. Tramal cystidia abundant, hyaline or brownish, tubular-clavate, usually tapering but sometimes slightly widened at the apex, arising from thin- or moderately thick-walled hyphae, with thickened (up to 3 μm) walls gradually thinning-out towards the apical part (thin-walled apical parts often collapsing), (45 –) 46 – 124 (– 127) × (5.2 –) 5.3 – 11.3 (– 11.8) μm (n = 134 / 7), single or in groups of 2 – 5, occasionally biradicate, sometimes tortuous; hymenial cystidia hyaline, broadly clavate to subglobose, thin-walled, quickly collapsing, 12 – 26 × 5.2 – 12.4 μm, scattered among basidia. Hyphidia present, simple or sparsely branched, 1 – 1.5 μm in diam. at the apex. Crystals occasionally present on hyphidia and cystidia, acicular or fused in stellate agglomerations. Basidia four-celled, longitudinally septate, ovoid-ellipsoid, pedunculate, (6.9 –) 7.0 – 9.1 (– 9.8) × (6.0 –) 6.1 – 7.2 (– 7.8) μm (n = 21 / 2), tightly glued together, stalk distinct, up to 4 × 3 μm, sterigmata up to 5 × 1.5 – 2 μm. Basidiospores smooth, thin-walled, ellipsoid to broadly cylindrical or cylindrical, more rarely lacrymoid, (4.6 –) 4.8 – 6.8 (– 7.2) × (3.0 –) 3.1 – 4.7 (– 4.9) μm (n = 210 / 7), L = 5.54 – 5.94, W = 3.59 – 4.11, Q’ = (1.2 –) 1.3 – 1.8 (– 1.9), Q = 1.44 – 1.63. Ecology and distribution. Europe (Slovenia – basidiocarps on wood; Estonia, Georgia, Portugal, and Romania – soil sequences), North America (USA, West Virginia – soil sequence) (see further remarks below); strongly rotten wood of deciduous trees (Fagus, Salix).	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
BF1E4600E6EF5302A0DC01278C8F497C.taxon	type_taxon	Type species. Protomerulius brasiliensis Möller.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
BF1E4600E6EF5302A0DC01278C8F497C.taxon	discussion	This genus was recently amended to include half-pileate poroid, effused odontioid, and corticioid taxa possessing stalked basidia and firm hyphae; these hyphae enter into a hymenial layer as thick-walled cystidia in effused species or form an axis of tube dissepiments in poroid species (Spirin et al. 2019 c). Here we describe two more corticioid species from Europe and reassess Protomerulius commotus Spirin & V. Malysheva based on more extensive material.	en	Spirin, Viacheslav, Malysheva, Vera, Viner, Ilya, Alvarenga, Renato Lúcio Mendes, Grebenc, Tine, Gruhn, Gérald, Savchenko, Anton, Grootmyers, Django, Ryvarden, Leif, Vlasák, Josef, Larsson, Karl-Henrik, Nilsson, R. Henrik (2025): Additions to the taxonomy of the Auriculariales (Basidiomycota) with pedunculate basidia. MycoKeys 120: 339-392, DOI: 10.3897/mycokeys.120.155492
