Hymenochaete sinensis Y.C. Li & C.L. Zhao, sp. nov. Figures 1 and 2.

MycoBank no.: MB 854216

Etymology:— sinensis (Lat.): refers to the country (China) where the type specimen was collected.

Holotype: — China. Yunnan Province, Qujing, Qilin District, Cuishan Forest Park, GPS coordinates: 25°55′ N, 103°69′ E, altitude: 2245 m, on a fallen branch of angiosperm, leg. C.L. Zhao, 5 November 2022, CLZhao 26040 (SWFC).

Basidiomata: —Annual, resupinate, closely adnate, ceraceous, without odor or taste, at first as small irregular patches up, later confluent up to 11 cm long, 2.5 cm wide, and 0.3 mm thick. Hymenial surface aurantium to coconut brown when fresh, coconut brown to brownish black upon drying. Sterile margin thinning, aurantium, up to 1 mm.

Hyphal system: —Monomitic; generative hyphae with simple-septate, colorless, distinctly thick-walled, frequently branched, interwoven, 2.5–3.5 µm in diameter; IKI–, CB–, tissues unchanged in KOH.

Hymenium: —Cystidia absent, cystidioles abundant, fusiform, slightly sinuous, colorless, thin-walled, 17–21 × 4.2–4.9 µm. Basidia barrelled, colorless, thin-walled, with four sterigmata and a basal simple septum, 10–12 × 3.1–3.8 µm; basidioles dominant, in shape similar to basidia, but slightly smaller. Setae abundant, distinctly thick-walled, subulate, with an acute tip, yellowish to reddish brown, 49–63 × 6.7–7.5 µm, projecting out of the hymenium up to 36 µm.

Spores: —Basidiospores ellipsoid to broadly ellipsoid, colorless, distinctly thick-walled, smooth, IKI–, CB–, 4–5 × 2.5–3.5 µm, L = 4.20 µm, W = 3.20 µm, Q = 1.31 (n = 30/1).

Additional specimens examined (paratypes): — China. Yunnan Province, Qujing, Qilin District, Cuishan Forest Park, GPS coordinates: 25°55′ N, 103°69′ E, altitude: 2245 m, on the fallen branch of angiosperm, leg. C.L. Zhao, 5 November 2022, CLZhao 26652, 13 April 2024, CLZhao 35894 (SWFC).