Lyomyces hengduanensis Q. Yuan & C. L. Zhao 2024, sp. nov.

Lyomyces hengduanensis Q. Yuan & C. L. Zhao sp. nov. Figs 3, 4 Type material. Holotype. China • Yunnan Province, Lincang, Fengqing County, Yaojie Town, GPS coordinates 24 ° 66 ' N, 100°19'E, altitude 2060 m, on a fallen branch of angiosperm, leg. C. L. Zhao, 22 October 2022, CLZhao 25551 (SWFC). Etymology. Hengduanensis (Lat.) refers to the type locality “ Hengduan Mountain ”. Description. Basidiomata annual, resupinate, adnate, brittle, without odour and taste when fresh and up to 3.5 cm long, 1 cm wide, 100 µm thick. Hymenial surface pruinose, white to cream when fresh, to cream to slightly buff upon drying. Sterile margin white to cream and up to 1 mm wide. Hyphal system monomitic, generative hyphae with clamp connections, colourless, thick-walled, branched, 2–3 µm in diameter; IKI –, CB –, tissues unchanged in KOH. Numerous crystals present amongst generative hyphae. Cystidia of two types: (1) fusoid, colourless, thin-walled, smooth, slightly constricted in the middle to somewhat sinuous, 17.5–25 × 3–4 µm; (2) subclavate, colourless, thin-walled, smooth, slightly constricted in the middle to somewhat sinuous, 16–23 × 3–4.5 µm; basidia clavate, with 4 sterigmata and a basal clamp connection, 10.5–14 × 3.5–5 µm. Basidiospores ellipsoid, colourless, thin-walled, smooth, with one oil drop, CB –, IKI –, 3.5–6 × 3–4.5 µm, L = 4.63 µm, W = 3.65 µm, Q = 1.25–1.28 (n = 90 / 3). Additional specimens examined (paratypes). China • Yunnan Province, Zhaotong, Qiaojia County, Yaoshan Town, Yaoshan National Nature Reserve, 26°50'N, 102°59'E, altitude 2500 m, on a fallen branch of angiosperm, leg. C. L. Zhao, 22 August 2020, CLZhao 20627 (SWFC) • Zhaotong, Wumeng Mountain National Nature Reserve, GPS coordinates 27 ° 72 ' N, 103 ° 92 ' E, altitude 1424 m, on a fallen branch of angiosperm, leg. C. L. Zhao, 29 August 2023, CLZhao 32713, CLZhao 32714, CLZhao 32782 (SWFC).