Hyphoderma tropicum Z.Y. Duan & C.L. Zhao, 2023

Duan, Ziyan, Guan, Qianxin, Luo, Kaiyue & Zhao, Changlin, 2023, Morphological and molecular identification of three new resupinate species of Hyphoderma (Hyphodermataceae, Agaricomycetes) from East Asia, Phytotaxa 599 (1), pp. 1-19 : 9-12

Hyphoderma tropicum Z.Y. Duan & C.L. Zhao , sp. nov. Figs. 5 , 6

MycoBank no.: MB 847192

Etymology:— tropicum (Lat.) refers to the locality (tropics) of the specimens.

Holotype:— CHINA. Yunnan Province, Wenshan, Wenshan National Nature Reserve , E 104°40′32″, N 23°19′32″, elev. 1258 m, on fallen angiosperm branch, 28 July 2019, CLZhao 17308 ( SWFC).

Fruiting body:— annual, resupinate, adnate, soft coriaceous when fresh, hard coriaceous upon drying, without odor and taste when fresh, and up to 20 cm long, 3 cm wide, and 100–200 µm thick. Hymenial surface tuberculate, white to cream when fresh, cream on drying, cracking. Margin sterile, narrow, and white to cream, up to 1–2 mm wide.

Hyphal structure: — Monomitic; generative hyphae with clamp connections,colorless, thin-walled, frequently branched, interwoven, 2.5–5 µm in diam, IKI–, CB–, tissues unchanged in KOH.

Hymenium: — Cystidia moniliform, thin-walled, 65–102.5 × 5.5–7.5 µm; basidia clavate, slightly constricted in the base to somewhat sinuous, with 4 sterigmata and a basal clamp connection, 29.5–38 × 4–6 µm; basidioles in shape similar to basidia, but slightly smaller.

Basidiospores: — 6.5–7.5(–8) × (2.5–)3–4 µm, L = 7.3 µm, W = 3.38 µm, Q = 2.16 (n = 30/1), ellipsoid to cylindrical, colorless, thin-walled, smooth, IKI–, CB–.

Figures

FIGURE 5. Basidiomata of Hyphoderma tropicum. Bars: A = 2 cm, B = 1 mm (Holotype: CLZhao 17308). Photo plate by: Zi-Yan Duan.

FIGURE 6. Microscopic structures of Hyphoderma tropicum (drawn from the holotype, CLZhao 17308). A: Basidiospores. B: Basidia and basidioles. C: Cystidia. D: Part of the vertical section of hymenium. Bars:A = 5 µm, B–D = 10 µm. Drawings by: Zi-Yan Duan.