Lyomyces albofarinaceus Y. F. Dai & C. L. Zhao sp. nov.

Figs 8, 9

Holotype.

China • Yunnan Province, Zhaotong, Wumengshan National Nature Reserve, GPS coordinates 28 ° 05 ′ N, 104 ° 20 ′ E, evel. 1600 m a. s. l., on a fallen branch of angiosperm, leg. C. L. Zhao, 20 September 2023, CLZhao 33479 (SWFC).

Etymology.

albofarinaceus (Lat.), refers to the white and pruinose hymenophore surface.

Basidiomata.

Annual, resupinate, adnate, without odor or taste when fresh, up to 8 cm long, 3.5 cm wide, and 150 µm thick. Hymenial surface pruinose, smooth, white when fresh, to white to cream upon drying. Sterile margin narrow, white, up to 1 mm wide.

Hyphal system.

Monomitic, generative hyphae with clamp connections, colorless, thin to slightly thick-walled, frequently branched, interwoven, 2.0–3.0 µm in diameter, IKI –, CB –; tissues unchanged in KOH, subhymenial hyphae densely covered by crystals.

Hymenium.

Cystidia of two types: (1) tapering, thin-walled, smooth to be covered by crystals, 11.5–44.0 × 4.5–7.5 µm; (2) capitate, thin-walled, smooth to be covered by crystals, slightly constricted at the neck, with a globose tip, 23.5–40.0 × 3.5–5.5 µm; cystidioles absent. Basidia clavate, colorless, thin-walled, with four sterigmata, 15.0–27.0 × 5.0–9.5 µm; basidioles in shape similar to basidia, but slightly smaller.

Basidiospores.

Broadly ellipsoid, colorless, thin-walled, smooth, with one guttate, IKI –, CB –, (5.5 –) 6.0–7.0 (– 7.5) × (4.5 –) 5.0–6.0 (– 6.5) µm, L = 6.46 µm, W = 5.62 µm, Q = 1.07–1.15 (n = 60 / 2).

Additional specimens examined (Paratype).

China • Yunnan Province, Qujing, Qilin District, Cuishan Forestry Park, on a fallen angiosperm branch, 5 November 2022, CLZhao 26661 (SWFC).