Hymenochaete weishanensis 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

Hymenochaete weishanensis Y. F. Dai & C. L. Zhao sp. nov.

Figs 6 , 7

Holotype.

China • Yunnan Province, Dali, Weishan County, Leqiu Town, Zhongyao Village , GPS coordinates 25°02′N, 100°16′E, evel. 1910 m a. s. l., on a fallen branch of angiosperm, leg. C. L. Zhao, 19 July 2022, CLZhao 22615 ( SWFC).

Etymology.

weishanensis (Lat.), refers to the locality (Weishan) of the holotype.

Basidiomata.

Annual, effused-reflexed, thin, coriaceous, without odor or taste when fresh, up to 5 cm long, 2.5 cm wide, and 150 µm thick. Pileal surface dark brown upon drying. Hymenial surface tuberculate, lightly brown when fresh, turning to gray brown upon drying. Sterile margin narrow, slightly gray-brown, up to 1 mm wide.

Hyphal system.

Monomitic, generative hyphae with simple-septa, colorless, thin to slightly thick-walled, frequently branched, interwoven, 2.0–2.8 µm in diameter, IKI –, CB –; tissues unchanged in KOH.

Hymenium.

Cystidia tapering, thin-walled, smooth, 9.5–20.5 × 2.0–3.5 µm; cystidioles absent. Hymenial setae abundant, subulate, reddish brown, thick-walled, smooth, 33.0–61.5 × 5.0–8.5 µm, projecting above the hymenium. Basidia subclavate, colorless, thin-walled, simple-septum, with four sterigmata, 6.5–24.0 × 2.5–4.0 µm; basidioles in shape similar to basidia, but slightly smaller.

Basidiospores.

Elipsoid to narrow ellipsoid, colorless, thin-walled, smooth, with one or two guttate, IKI –, CB –, 4.0–5.0 (– 5.5) × 2.0–3.0 µm, L = 4.76 µm, W = 2.52 µm, Q = 1.86–1.92 (n = 60 / 2).

Additional specimens examined (Paratype).

China • Yunnan Province, Dali, Weishan County, Leqiu Town, Zhongyao Village , on a fallen angiosperm branch, 19 July 2022, CLZhao 40297 ( SWFC) .

Figures

Figure 6. Basidiomata of Hymenochaete weishanensis in general and detailed views (CLZhao 22615, holotype). Scale bars: 1 cm (A); 1 mm (B).

Figure 7. Microscopic structures of Hymenochaete weishanensis (holotype, CLZhao 22615). A Basidiospores B basidia and basidioles C tapering cystidia D setae E part of the vertical section of hymenium. Scale bars: 10 µm (A – E).