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

Zhou, Hong-Min, Zhang, Xun-Chi, Li, Jie-Ting, Wu, Fang & Zhao, Chang-Lin, 2024, Morphological characteristics and phylogenetic analyses revealed four new wood inhabiting fungi (Agaricomycetes, Basidiomycota) in Xizang Autonomous Region, China, MycoKeys 106, pp. 201-224 : 201-224

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) .

Figures

Figure 9. Basidiomata of Leptosporomyces linzhiensis (holotype, CLZhao 31183). Scale bars: 1 cm (A); 1 mm (B).

Figure 10. Microscopic structures of Leptosporomyces linzhiensis (holotype, CLZhao 31183) a basidiospores b basidia c basidioles d A section of hymenium. Scale bars: 5 μm (a); 10 μm (b – d).