Hygrophorus griseodiscus 2020

Hygrophorus griseodiscus C.Q. Wang & T.H. Li 2020

Fungal Names: FN 570000

Holotype: China, Sichuan Province, Jiuzhaigou, elev. ca. 3100 m, 11 September 2012, X.L. He (SAAS462, Holotype!).

Morphological description

Pileus 20–45 mm broad, convex, obtusely umbonate at disc, grey to light grey (1C1, 1D1), medium to dark grey or olive grey (1E1, 1F1–4) at disc, white to pale grey (1B1) at margin, glutinous when wet; margin even, slightly involuted to extended. Lamellae emarginate with decurrent tooth or subdecurrent, white, thick, subcrowded, unequal, with 1–3 lamellulae between two entire lamellae. Stipe 40–70 × 4–6 mm, cylindrical, white to pale grey (1B1), covered with transparent glutinous materials when wet. Context slightly thick, white.

Basidiospores (7)8–10(10.5) × (4)4.5–6(6.5) µm [mean length = 9 µm, mean width = 5.2 µm], Q = 1.4–2.1, Qm = 1.74, ellipsoid, oblong to subcylindrical, smooth, hyaline. Basidia 29–56.5 × 7–11 µm, Q = 3.05–6(6.9), Qm = 4.39, clavate to cylindrical, thin-walled, 4-spored, with sterigmata up to 6 µm long. Pileipellis an ixotrichoderm, covered with a gelatinous layer; hyphae thin-walled, 2.5–6 µm wide. Hymenophoral trama divergent, composed of septate, thin-walled and cylindrical hyphae; hyphal cells 5.5–20 µm in width, hyaline. Clamp connections present.

Habitat: Scattered, on the ground of subalpine coniferous forest dominated by Abies and Picea, often surrounded by mosses

Distribution: So far only known from Sichuan Province in Southwest China.

GenBank Accession: ITS: MN378338.

Notes:

Reference: Wang C-Q, Li T-H, Zhang M et al.(2020) Hygrophorus subsection Hygrophorus (Hygrophoraceae, Agaricales) in China. MycoKeys 68: 49–73. https://doi.org/10.3897/mycokeys.68.53264

Hygrophorus griseodiscus (SAAS462, Holotype). a, b Basidiomata c Basidiospores d Basidia e Elements of pileipellis.