taxonID	type	description	language	source
A309553EFFC6FFEBFF3AFBCDD7AEFC9D.taxon	etymology	Etymology: — Hengduanensis (Lat.): refers to the species growing in the Hengduan Mountains. Holotype: — CHINA. Yunnan Province, Deqin County, Meili Snow Mts. Geopark, Mingyong Glacier, on dead branch of living tree of Quercus semecarpifolia, elev. 3200 m, N 28 ° 27 ′ 23 ″, E 98 ° 45 ′ 5 ″, 4 September 2021, Dai 22801 (BJFC 037374). Description: — Basidiomata perennial, sessile, tough, woody to corky, without odor or taste when fresh, hard corky and significantly lighter in weight when dry. Pilei ungulate, projecting up to 1.8 cm, 3 cm wide and 2.5 cm thick at the base. Upper surface greyish brown, fawn to dark grey when fresh and dry, usually with a hard glabrous crust, concentrically zonate and sulcate; margin cinnamon to pale reddish brown, obtuse. Pore surface greyish brown when fresh and dry, slightly shiny; pores round, 3 – 5 per mm; pore mouth sometimes with white mycelium; dissepiments thick, entire; sterile margin distinct, pinkish buff, up to 6 mm wide. Context fawn to reddish brown, corky, up to 15 mm thick, with granular core developing at the upper part. Tubes slightly darker than pore surface, fawn, woody hard, up to 1 cm long. Hyphal structure: — trimitic; generative hyphae bearing clamp connections; skeletal and binding hyphae IKI−, CB−; tissues darkening in KOH. Structure of context: — generative hyphae infrequent, colorless, thin-walled, unbranched, straight, 2 – 4 μm in diam.; skeletal hyphae dominant, thick-walled with a medium to narrow lumen to subsolid, occasionally branched, straight, interwoven, 3 – 6 μm in diam., binding hyphae colorless, thick-walled with a medium lumen, frequently branched, flexuous, 1.5 – 3 μm in diam. Structure of tubes: — generative hyphae infrequent, colorless, thin- to slightly thick-walled, unbranched, slightly flexuous, 2 – 5 μm in diam.; skeletal hyphae dominant, colorless, thick-walled with a narrow lumen to subsolid, sometimes dichotomously branched, straight, interwoven, 2 – 5 μm in diam., binding hyphae thick-walled with a narrow lumen to subsolid, frequently branched, flexuous, 1.5 – 3 μm in diam. Cystidia absent; cystidioles clavate to fusoid, thin-walled, smooth, 18 – 21 × 7 – 9 μm. Basidia broadly barrel-shaped, with four sterigmata and a basal clamp connection, 15 – 16 × 13 – 14 µm; basidioles of similar shape to basidia but smaller. Basidiospores cylindrical, colorless, thin- to slightly thick-walled, smooth, IKI−, CB−, (9 –) 9.5 – 14 (– 14.5) × 4.5 – 7 µm, L = 11.46 μm, W = 5.7 μm, Q = 1.99 – 2.12 (n = 60 / 2). Type of rot: — White rot. Additional specimen examined (paratype): — CHINA. Yunnan Province, Chuxiong, Wuding County, Shizishan Natural Reserve, on dead tree of Quercus semecarpifolia, elev. 2600 m, 4 August 2019, Dai 20384 (BJFC 032052). Notes: — Fomes fomentarius and F. inzengae are very similar to F. hengduanensis, but F. fomentarius has longer basidiospores (15 – 21 × 5 – 7 µm vs. 9.5 – 14 × 4.5 – 7 µm, Tomšovský et al. 2023) as does F. inzengae (15 – 19 × 5 – 7 µm vs. 9.5 – 14 × 4.5 – 7 µm, Tomšovský et al. 2023).	en	Cui, Yu-Jin, Liu, Hong-Gao, Dai, Yu-Cheng, Wang, Chao-Ge (2024): A new species of Fomes (Polyporaceae, Basidiomycota) from southwestern China. Phytotaxa 661 (3): 282-292, DOI: 10.11646/phytotaxa.661.3.5, URL: https://doi.org/10.11646/phytotaxa.661.3.5
