Steccherinum wumengshanense L. Wang & C.L. Zhao

Wang, Lu, Su, Jiangqing, Muhammad, Akmal & Zhao, Changlin, 2024, Two new wood-inhabiting fungal species (Polyporales, Basidiomycota) from Yunnan Province, China, Phytotaxa 647 (1), pp. 1-18 : 7-11

Steccherinum wumengshanense L. Wang & C.L. Zhao , sp. nov. Figs. 5 and 6 .

MycoBank no.: 851550.

Etymology: — wumengshanens (Lat.) : refers to the locality (Wumengshan National Natural Reserve) of the type specimen.

Holotype: — CHINA. Yunnan Province: Zhaotong, Yiliang County, Luozehe Town , Lijiaping Village , GPS coordinates: 27°29′ N, 103°55′ E, altitude: 1900 m asl., on the fallen branch of angiosperm, leg. C.L. Zhao, 24 August 2022, C.L. Zhao 23586 ( SWFC!).

Basidiomata: —Annual, resupinate, adnate, corticoid, up to 3 cm long, 2 cm wide, and 1 mm thick. Hymenial surface grandinoid, white when fresh, turning to white to cream (4A2/3) upon drying, aculei 5–8 per mm, the length of aculei up to 0.1 mm. Sterile margin narrow, cream (4A2/3), up to 0.5 mm wide.

Hyphal system: —Monomitic; generative hyphae with clamp connections, colorless, thin-walled, frequently branched, interwoven, 2.5–4 µm in diameter; IKI–, CB –, tissues unchanged in KOH.

Hymenium: —Skeletocystidia numerous, subclavate to cylindrical, colorless, thin-walled, strongly encrusted in the surface and almost entirely, 75–97 × 10–12 µm; cystidioles absent. Basidia subclavate to barrel, hyaline, thin-walled, with a basal clamp connection and four sterigmata, 15–18 × 5–6.5 µm; basidioles dominant, in shape similar to basidia, but slightly smaller.

Spores: —Basidiospores ellipsoid to subglobose, hyaline, thin-walled, smooth, IKI–, CB –, (4–)4.5–6(–6.5) × 3–4.5 µm, L = 5.16 µm, W = 3.69 µm, Q = 1.40 (n = 30/1).

Figures

FIGURE 5. Steccherinum wumengshanense (holotype, C.L. Zhao 23586): basidiomata on the substrate (A), macroscopic characteristics of hymenophore (B). Bars: (A) = 1 cm and (B) = 1 mm.

FIGURE 6. Microscopic structures of Steccherinum wumengshanense (holotype, C.L. Zhao 23586): basidiospores (A), basidia and basidioles (B), cystidia (C), a section of the hymenium (D). Bars: A= 5 µm, (B–D) = 10 µm.