Hydnellum hangzhouense X.P. Fan, Y.F. Sun & B.K. Cui, 2025

Fan, Xiang-Ping, Song, Chang-Ge, Xu, Yi-Hua, Sun, Yi-Fei & Cui, Bao-Kai, 2025, Morphology and molecular phylogeny reveal one new species of Hydnellum (Thelephorales) from Eastern China, Phytotaxa 711 (1), pp. 43-60 : 52

Hydnellum hangzhouense X.P. Fan, Y.F. Sun & B.K. Cui sp. nov. ( Figures 2–4 )

MycoBank no.: MB 857253

Diagnosis:—Differs from H. crassipileatum and H. chocolatum by its thick pileus, azonate pileal surface with light brown to dark brown color, and relatively narrower basidiospores.

Type:— CHINA. Zhejiang Province: Hangzhou, Chunan, Hongye Bay Scenic Area, on the ground of the mixed coniferous-broadleaf forest, 29°37′55.308″N, 118°57′35.719″E, elev. 124 m, 15 May 2024, Wu 1679 (Holotype, BJFC045989).

Etymology:— hangzhouense (Lat.) refers to the collection site of this specimen.

Description:— Basidiomata annual, eccentrically stipitate, single to concrescent, with odor or taste when fresh. Pileus circular to elliptical, up to 3.8 cm in diam and 0.7 cm thick at the center. Pileal surface light brown (6D5) to dark brown (6F5) when fresh, becoming grayish brown (6E3) upon drying, azonate, tomentose; margin white to grayish brown (6E3) when fresh, becoming dark brown (6F7) upon drying, up to 6 mm wide. Context light brown (6D4) when fresh, dark brown (6F7) upon drying., fragile, up to 5 mm thick. Spines soft, light brown (6D5) to white when fresh, becoming light brown (6D8) to grayish brown (7E4) upon drying, fragile, and up to 6 mm long. Stipe cylindrical and glabrous, surface layer grayish brown (7E4), and inner layer dark brown (6F5), and up to 3 cm long and 1.3 cm in diam.

Hyphal structure:—Hyphal system monomitic; generative hyphae with simple septa; all the hyphae IKI–, CB–, turned to olive-green in KOH.

Context:—Generative hyphae colorless to clay-buff, thick-walled, branched, interwoven to regularly arranged, 3.5–5.5 µm in diam.

Spines:—Generative hyphae colorless to clay-buff, thick-walled, rarely branched, interwoven to regularly arranged, 2.5–4.5 µm in diam. Cystidia and cystidioles absent. Basidia clavate, bearing four sterigmata (3–4.5 µm long) and a basal simple septum, 16–33 × 5–7.5 µm; basidioles similar to basidia in shape, but slightly smaller.

Stipe:—Generative hyphae colorless to clay-buff, thick-walled, rarely branched, interwoven in the surface layer, regularly arranged in the inner layer, and 2.5–6.5 µm in diam.

Spores:—Basidiospores subellipsoid to ellipsoid, colorless, thin-walled, echinulate, IKI–, CB–, 4–5.6(–6) × (3–)3.2–5(–5.5) µm, L = 4.85 µm, W = 3.25 µm, Q = 1.49 (n = 90/1, without the ornamentation).

Ecological habits:— H. hangzhouense was collected from eastern China with subtropical monsoon climate. It grows on the moist ground of the moss and mixed coniferous-broadleaf forest.

Figures

FIGURE 2. Basidiomata of Hydnellum hangzhouense (Holotype, Wu 1679). Scale bars: 2 cm.

FIGURE 3. Scanning Electron Microscope (SEM) of basidiospores of Hydnellum hangzhouense (Holotype, Wu 1679).

FIGURE 4. Microscopic structures of Hydnellum hangzhouense (Holotype, Wu 1679). A) Basidiospores. B) Hyphae from context. C) Basidia and basidioles. D) Hyphae from spines. E) Hyphae from the inner layer of stipe. F) Hyphae from the surface layer of stipe.