Leptosporomyces linzhiensis C. L. Zhao & H. M. Zhou 2024, sp. nov.

Leptosporomyces linzhiensis C. L. Zhao & H. M. Zhou sp. nov. Figs 9, 10 Holotype. China, Xizang, Linzhi, Sjilashan Forest Park, 29 ° 64 ' N, 94 ° 71 ' E, elev. 3848 m, on fallen trunk of Abies, 2 August 2023, CLZhao 31183 (SWFC). Etymology. Linzhiensis (Lat.): refers to the locality (Xizang) of the type specimens. Diagnosis. Differed from other species in having white basidiomata, monomitic hyphal system, cylindrical to oblong ellipsoid basidiospores (3.8–4. × 1.7–2 µm). Fruiting body. Basidiomata resupinate, athelioid, membranous upon drying, without odor or taste when fresh, up to 10 cm long, 4 cm wide, 200 µm thick. Hymenial surface smooth to cracked, white with pink tint when fresh, turning to yellowish cream upon drying. Margin sterile, white, fimbriate. Hyphal structure. Hyphal system monomitic, generative hyphae with clamp connections, colorless, thin- to slightly thick-walled, branched, interwoven, 2–5 µm in diameter, IKI –, CB –; tissues turn black in KOH. Hymenium. Hyphal system monomitic, generative hyphae with clamp connections, colorless, thin-walled, branched, interwoven, 2–3.5 µm in diameter, IKI –, CB –. Basidia clavate, with 4 sterigmata and a basal clamp connection, 11.5–13.5 × 3.2–3.8 µm. Spores. Basidiospores cylindrical to oblong ellipsoid, colorless, smooth, thin-walled, IKI –, CB –, (3.5 –) 3.8–4.3 (– 4.7) × (1.7 –) 1.7–2 (– 2.3) µm, L = 4.02 µm, W = 1.88 µm, Q = 1.95–2.18 (n = 90 / 3). Additional specimens examined (paratypes). China, Xizang, Linzhi, Sjilashan Forest Park, 22 ° 57 ' N, 103 ° 42 ' E, elev. 2100 m, on fallen trunk of Abies, 2 August 2023, CLZhao 31174 (SWFC); on fallen trunk of Abies, 2 August 2023, CLZhao 31187 (SWFC); on fallen trunk of Abies, 2 August 2023, CLZhao 31190 (SWFC).