Lyomyces albofarinaceus Y. F. Dai & C. L. Zhao, 2025

Dai, Yunfei, Yuan, Qi, Yang, Xin, Liu, Rui, Liu, Defu, Yuan, Haisheng & Zhao, Changlin, 2025, Morphological characteristics and phylogenetic analyses reveal five new species of Hymenochaetales (Agaricomycetes, Basidiomycota) from southwestern China, MycoKeys 114, pp. 133-175 : 133-175

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) .

Figures

Figure 8. Basidiomata of Lyomyces albofarinaceus in general and detailed views (CLZhao 33479, holotype). Scale bars: 1 cm (A); 1 mm (B).

Figure 9. Microscopic structures of Lyomyces albofarinaceus (holotype, CLZhao 33479). A Basidiospores B basidia and basidioles C tapering cystidia D Capitate cystidia E part of the vertical section of hymenium. Scale bars: 10 µm (A – E).