Hyphoderma cinereofuscum W. Li & C.L. Zhao, 2025

Li, Wen, Wang, Xiyan, Chen, Daxiang, Zhang, Sicheng, Li, Yunchao, Zhao, Changlin & Zhan, Zhongyi, 2025, Molecular phylogeny and morphology reveal a new wood-inhabiting fungus, Hyphoderma cinereofuscum (Polyporales, Basidiomycota), from southwest China, Phytotaxa 683 (2), pp. 106-118 : 111

Hyphoderma cinereofuscum W. Li & C.L. Zhao , sp. nov. Figs. 2 , 3

MycoBank no.: MB 856300

Etymology —Cinereofuscum (Lat.) refers to the species having fuscous basidiomata with cinereous hymenial surface.

Holotype: — CHINA. Yunnan Province, Dehong, Yingjiang County, Tongbiguan Provincial Nature Reserve , GPS coordinates 24°35' N, 97°39' E, altitude 1006 m asl., on the fallen branch of angiosperm, leg. C.L. Zhao, 19 July 2023, CLZhao 30341 ( SWFC).

Basidiomata: —Annual, resupinate, adnate, coriaceous, odorless when fresh, up to 26 cm long, 3.5 cm wide, and 50–100 µm thick. Hymenial surface smooth, white to cream when fresh, and cinereous and fuscous when dry. Sterile margin cinereous, up to 2 mm wide.

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

Hymenium: —Cystidia of two types: 1) tubular cystidia, colorless, thin-walled, 25.9–37.1 × 1.8–2.5 µm; 2) capitate cystidia, colorless, thin-walled, 12.5–15.5 × 6.2–7 µm. Basidia clavate to subcylindrical, more or less constricted in the middle, with four sterigmata and a basal simple septum, 23.5–26 × 5.3–6.5 µm; basidioles dominant, similar to basidia in shape, but slightly smaller, and usually with a few guttules.

Spores: —Basidiospores cylindrical, colorless, thin-walled, smooth, and usually with a few guttules, IKI–, CB–, (8.5–)9–11.5(–12) × (4–)4.5–5(–5.5) µm, L = 10.04 µm, W = 4.59 µm, Q = 2.17–2.22, Q m = 2.19 ± 0.15 (n = 60/2).

Additional specimen examined (paratype): — CHINA. Yunnan Province, Dehong, Yingjiang County, Tongbiguan Provincial Nature Reserve, GPS coordinates 24°35'N, 97°39'E, altitude 1006 m asl., on the fallen branch of angiosperm, leg. C.L. Zhao, 19 July 2023, CLZhao 30283 (SWFC).

Figures

FIGURE 2. Hyphoderma cinereofuscum (holotype, CLZhao 30341): basidiomata on the substrate (A), macroscopic characteristics of hymenophore (B). Bars: (A) = 2 cm and (B) = 1 mm.

FIGURE 3. Microscopic structures of Hyphoderma cinereofuscum (holotype, CLZhao 30341): basidiospores (A), basidia and basidioles (B), capitate cystidia (C), tubular cystidia (D), a section of the hymenium (E). Bars: (A–E) = 10 µm.