Hyphodermella sinensis L. Wang & C.L. Zhao, sp. nov. Figs. 4 and 5.

MycoBank no.: 851548.

Etymology: — sinensis (Lat.): refers to the locality (China) of the type specimen.

Holotype: — CHINA. Yunnan Province, Qujing, Qilin District, Cuishan Forest Park, GPS coordinates: 25°55′ N, 103°69′ E, altitude: 2245 m asl., on the fallen branch of angiosperm, leg. C.L. Zhao, 27 October 2022, CLZhao 25866 (SWFC) .

Basidiomata: —Annual, resupinate, adnate, membranaceous, and up to 10 cm long, 4 cm wide and 0.1 mm thick. Hymenial surface smooth, white to slightly greyish when fresh, become greyish to honey yellow when dry. Sterile margin indistinct, white to slightly greyish, up to 1 mm.

Hyphal system: —Monomitic; generative hyphae with clamp connections, colorless, thin-walled, frequently branched, interwoven, 3–4.5 µm in diameter; IKI–, CB–, tissues unchanged in KOH.

Hymenium: —Cystidia clavate, colorless, thin-walled, 18–30 × 2–3 µm. Basidia clavate, colorless, thin-walled, with a basal clamp connection and four sterigmata, 14.5–16 × 3–4 µm; basidioles dominant, in shape similar to basidia, but slightly smaller.

Spores: —Basidiospores broadly ellipsoid, colorless, thin-walled, smooth, IKI–, CB–, 4–6(–6.5) × (2.5–)3–4 µm, L = 5.24 µm, W = 3.63 µm, Q = 1.32–1.44 (n = 90/3).

Additional specimens examined: — CHINA. Yunnan Province, Wenshan, Xichou County, Dongma Town, Xinzhai Village, GPS coordinates: 23°45′ N, 104°90′ E, altitude: 1205 m asl., on the fallen branch of angiosperm, leg. C.L. Zhao, 16 January 2019, CLZhao 11267; Qujing, Qilin District, Cuishan Forest Park, GPS coordinates: 25°55′ N, 103°69′ E, altitude: 2245 m asl., on the fallen branch of angiosperm, leg. C.L. Zhao, 27 October 2022, CLZhao 25922 (SWFC).