Scleroderma furfuraceum Rebriev & Zvyagina, 2022

Rebriev, Yury A. & Zvyagina, Elena A., 2022, Scleroderma furfuraceum (Boletales, Agaricomycetes) - a new species from the Russian Far East, Phytotaxa 555 (2), pp. 169-177 : 170-174

Scleroderma furfuraceum Rebriev & Zvyagina , sp. nov. ( Fig. 2 )

Mycobank No: MB 843403.

Diagnosis:— Scleroderma furfuraceum differs from the closest species, S. citrinum , in having smaller basidiomata up to 20 mm diam. and bigger basidiospores (11–) 11.8–16.3 (–17.0) µm diam. (including ornamentation).

Etymology:—‘ furfuraceum ’ refers to the grainy scales of the peridium.

Type:— RUSSIAN FEDERATION. Primorsky Krai, Shkotovsky district, vicinity of Anisimovka village, Litovka mount., camp site Gribanovka , N 43.1302°, E 132.7913°, on well-rotted stump in mixed forest with Quercus mongolica, Pinus koraiensis, Abies holophylla , Tilia amurensis , Betula maximowicziana , Corylus mandshurica , 31 August 2021, Yu. Rebriev (holotype LE-F 342317 ! , ITS sequence GenBank OM874610 ).

Description:— Basidiomata small, (12–) 14–17 (–20) mm diam., (9–) 11–13 (–14) mm high, subglobose, with a tuft of mycelial strands, sessile or with a reduced buried pseudostipe. Peridium thin, tough, less than 1– 0.5 mm thick at maturity in the equatorial part of dry specimens and less than 0.1 mm thick near the apical pore, pale yellowish brown (R 230, G 225, B 200 according to Adobe Photoshop CS5 foreground color), yellowish brown (R 248, G 240, B 207) to brown (R 224, G 215, B 158), bearing numerous, small, concolorous to dark reddish brown (R 140, G 90, B 55) scales and warts and consisting of two layers. The outer layer consists of thick-walled yellowish brown to hyaline branched hyphae, on average 3–7 μm diam, with septa and clamp connections. The inner layer consists of thin-walled hyaline branched hyphae on average 5–13 μm diam, sometimes collapsed, with numerous septa and clamp connections. If the scales and warts are worn away a reticulate pattern remains. Dehiscence is by the lacerate irregular apical pore. Gleba solid, dark grey often with violaceous tint when young to pulverulent and grey in maturity, with whitish to creamcoloured plates of trama. Odour not noted.

Basidiospores (11–) 11.8–16.3 (–17.0) μm diam. (including ornamentation), globose, dark brown; surface ornamentation a conspicuous complete to slightly incomplete reticulum, 2.5–3.0 (–4.0) μm high. Basidia not observed.

Ecology: — Solitary or gregarious, on soil, litter or humified wood in broad-leaved and coniferous-deciduous (mixed) forests dominated by Quercus spp . mainly, possibly mycorrhizal with Quercus spp .

Distribution:— S. furfuraceum is commonly distributed in the subtropical Russian Far East as well as in Japan.

Additional specimens examined:— RUSSIAN FEDERATION. Primorsky Krai, Shkotovsky district, vicinity of Anisimovka village, Litovka mount., N 43.1033°, E 132.7829°, on soil in mixed forest with Quercus mongolica, Pinus koraiensis, Abies holophylla , Tilia amurensis , Betula maximowicziana , Corylus mandshurica , 26 August 2021, Yu. Rebriev (LE-F 342313!, ITS sequence GenBank OM874612 ); Primorsky Krai, Sikhote-Alin Nature Reserve, N 45.2584° E 136.5028°, on soil in mixed forest with Quercus mongolica , Tilia sp. , Acer mono , Pinus sibirica , Abies sibirica , 21 August 2013, O. Morozova (LE-F 342309); ibid., N 44.25849937° E 136.0688°, on soil in mixed forest with Abies nephrolepis , Betula maximowicziana , 05 September 2013, E. Malysheva and V. Malysheva (LE-F 342310!); Primorsky Krai, Chuguevskiy district, Verhneussuriskiy research station, N 44.04° E 134.041°, on soil in Abies - dominated forest, 19 August 1973, E. Bulakh (VLA M 17877!); ibid., on litter in forest with dominance of mixed forest with Quercus mongolica, Pinus koraiensis, 17 September 1974, E. Bulakh (VLA M 17878!); Jewish Autonomous Oblast, Bastak Nature Reserve, up the Bastak river, 49.02°N, 133.03°E, on humified wood in mixed forest, 13 August 2000, E. Bulakh (VLA M 15345!).

Figures

FIGURE 2. Scleroderma furfuraceum Rebriev & Zvyagina. A. Basidiomata (holotype LE-F 342317); B. Basidiomata (LE-F 342309); C. Basidiospores under SEM (holotype LE-F 342317); D. Basidiospores under LM (LE-F 342313) Photos by: Yu. Rebriev (A, D); O. Morozova (B); A. Nazarenko and Yu. Rebriev (C).