Hyphoderma marginatum 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 : 7

Hyphoderma marginatum Z.Y. Duan & C.L. Zhao , sp. nov. Figs. 3 , 4

MycoBank no.: MB 847109

Etymology:— marginatum (Lat.) refers to the basidiomata with upwarping margin of the specimens.

Holotype:— CHINA. Yunnan Province, Puer, Zhenyuan County, Xieqipo Forestry Park , E101°5′54″, N25°00′50″, elev. 1500 m, on fallen angiosperm branch, 1 October 2017, CLZhao 3404 ( SWFC).

Fruiting body:— annual, resupinate, adnate, membranous, without odor and taste when fresh, and up to 20 cm long, 2.5 cm wide, and 30–100 µm thick. Hymenial surface smooth, slightly cream when fresh, cream on drying, cracking, hard fragile. Margin sterile, narrow, upwarping, cream, up to 2 mm wide.

Hyphal structure: — Monomitic, generative hyphae with clamp connections,colorless, thin-walled, frequently branched, interwoven, 2.5–4.5 µm in diam, IKI–, CB–, tissues unchanged in KOH.

Hymenium: — Cheilocystidia cylindrical, slightly wider at the top, slightly constricted, thin-walled, 30–48.5 × 7.5–11.5 µm; basidia clavate to subcylindrical, slightly constricted in the base to somewhat sinuous, with 4 sterigmata and a basal clamp connection, 21–31.5 × 5–7 µm; basidioles in shape similar to basidia, but slightly smaller.

Basidiospores: — (8.5–)9–10(–10.5) × 3.5–4.5(–5) µm, L = 9.68 µm, W = 3.99 µm, Q = 2.42 (n = 30/1), cylindrical, colorless, thin-walled, smooth, with irregular vacuole inside, IKI–, CB–.

Figures

FIGURE 3. Basidiomata of Hyphoderma marginatum. Bars: A = 2 cm, B = 1 mm (Holotype: CLZhao 3404). Photo plate by: Zi-Yan Duan.

FIGURE 4. Microscopic structures of Hyphoderma marginatum (drawn from the holotype, CLZhao 3404).A: Basidiospores. B: Basidia and basidioles. C: Cystidia and cystidioles. D: Part of the vertical section of hymenium. Bars: A = 5 µm, B–D = 10 µm. Drawings by: Zi-Yan Duan.