Cortinarius pseudosalor P. Long & Z.H. Chen, 2024

Long, Pan, Zhou, Song-Yan, Li, Sai-Nan, Liu, Fei-Fei & Chen, Zuo-Hong, 2024, Three new species of Cortinarius section Delibuti (Cortinariaceae, Agaricales) from China, MycoKeys 101, pp. 143-162 : 143

Cortinarius pseudosalor P. Long & Z.H. Chen sp. nov.

Figs 4 , 5

Etymology.

Pseudosalor (Latin) refers to the species morphologically similar to Cortinarius salor .

Holotype.

China, Hubei Province: Hefeng County, Mulinzi National Nature Reserve, at 30.058935°N, 110.209541°E, alt.1413 m, 1 August 2020, Z.H. Chen, P. Long and S.N. Li, (MHHNU 32082).

Diagnosis.

This species differs from other species in sect. Cortinarius Delibuti for its high morphological similarity with C. salor , but having smaller coarsely verrucose basidiospores.

Description.

Basidiomes small to medium-sized, development type stipiocarpic. Pileus 2.8-6.5 cm, at first broadly convex, then lower convex to plane, margin incurved when young, decurved to upturned at maturity; bluish violaceous (18A3-18C5) when young, tinge of white at the centre when chapped, later fading to ochraceous grey (5B6-5C7) when old with brown (5B8-5C8) universal veil remains at margin; dry, viscid. Context dirty white, soft. Lamellae adnexed, pale yellow (1A2) with lilac tint (16A1-16A2) then brownish (5B6-5D7), moderately distant, sometimes margin wavy. Stipe clavate, gradually slender to the apex, 4-8.4 cm long, 0.4-1.0 cm wide, violaceous (16A2-16A4) when young then fading to upper dirty white, whitish mauve (16A2) at base, leaving an ochraceous ring (5B8-5C8) on the upper stem, hollow in centre. Odour indistinct.

Basidiospores [60/3/3] (7.3-) 7.4-8.4 × (5.7-) 6.0-7.4 (-7.5) μm, av. 7.9 × 6.7 μm, Q = (1.11) 1.12- (1.26) 1.27, Qm = 1.18 ± 0.11, subglobose to broadly ellipsoid, yellowish brown, coarsely verrucose, without amyloid and dextrinoid reaction. Basidia (29-) 30-38 × (8-) 9-12 μm, 4-spored, sterigmata up to 3.7-5.0 μm, clavate to subcylindrical, colourless or with amber yellow granules. Pileipellis duplex obviously, hyphae 2-6 μm wide, epicutis gelatinous, 50-75 μm thick, composed of colourless or amber yellow, moderately interwoven hyphae, hypocuits 50-75 μm thick, composed of colourless or amber yellow, hyphae nearly parallel cylindrical. Lamellar edges fertile. Cystidia absent. Lamellar trama regular, 45-55 μm thick, composed of hyphae and inflated cells, hyphae 2-5 μm wide, inflated cells 14-24 × 5-9 μm. Stipitipellis gelatinous, stipe hyphae 2-7 μm wide, thin-walled, cylindrical, weakly interwoven. Clamp connections present in all tissues.

Habitat, ecology and distribution.

Solitary to gregarious on soil in coniferous and broad-leaved mixed forest or evergreen broad-leaved forest, known from Hunan and Hubei, China; August.

Additional specimens examined.

China, Hunan Province: Yongshun County, Xiaoxi National Nature Reserve , at 28.4215 -28.5355 °N, 110.650- 110.2135°E, alt. 1000-1300 m, 30 August 2014, P. Zhang, (MHHNU 8349) ; Hubei Province: Hefeng County, Xiaping Town , at 30.046382°N, 110.136712°E, alt. 1223 m, 2 August 2020, Z.H. Chen, P. Long and S.N. Li, (MHHNU 32148) .

Notes.

Cortinarius pseudosalor is easily misidentified as C. salor for their high morphological similarity, except the former has smaller coarsely verrucose basidiospores. Besides, C. pseudosalor distributed in Central China under coniferous and broad-leaved mixed forest or evergreen broad-leaved forest at alt. 1000-1413 m.

Figures

Figure 4. Basidiomes of Cortinarius pseudosalor (a, b MHHNU 32082 c, d MHHNU 8349).

Figure 5. Microscopic features of Cortinarius pseudosalor (MHHNU 32082) a scanning electron micrograph of basidiospore b basidiospores c basidia with probasidium d lamellae edge e stipitipellis f pileipellis. Scale bars: 1 μm (a); 10 μm (b-e); 20 μm (f).