Hygrophorus glutiniceps 2020

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

Fungal Names: FN 570663

Holotype: China, Guangdong Province, Guangzhou City, Tianluhu Forest Park, on the ground of a forest dominated by Castanopsis fissa, elev. ca. 250 m, 23°13'39"N, 113°25'53"E, 6 September 2012, M. Zhang (GDGM42188, Holotype!)

Morphological description

Pileus 8–40 mm broad, hemispherical to convex, often with an inconspicuous umbo and a usually involute margin when young, broad-convex to depressed with a slightly incurved to rarely uplifting margin when mature, covered with a layer of gelatine-like or transparent gluey materials when wet, white with cream or light yellow to orange tint (4A2–4) at disc, becoming light to yellowish-brown (5E8) with age (especially at margin and in wounded area), usually brownish-orange (5C5) to brown (6E8) when exsiccated. Lamellae broadly adnate or with decurrent tooth when young, short to moderately decurrent when mature, white when young, then changing to ochraceous or even brown (6E8), waxy when wet, with 25–30 complete lamellae reaching to stipe and 1–3 lamellulae between two entire lamellae. Stipe 25–60 × 3–6 mm, equal but often thinner at the base, cylindrical but usually curved, white, occasionally with yellowish tint (2A2), covered with transparent glutinous materials when wet. Context thin, white when young, changing to brown when old.

Basidiospores (5)6–8.5(10) × (3.5)4–5.5(6) µm [mean length = 7.1 µm, mean width = 4.7 µm], Q = (1.2)1.3–1.77(2), Q_m = 1.52, ellipsoid to oblong, smooth, hyaline. Basidia 35–47 × 5–8.5 µm, Q values usually more than 5, clavate, thin-walled, 4-spored, with sterigmata up to 7.5 µm long, hyaline. Pileipellis an ixotrichoderm, composed of septate hyphae, usually covered with a gelatinous layer; hyphae thin-walled, 3–5 µm wide, with yellowish gluten in KOH. Stipitipellis an ixotrichoderm, hyphae 3–5 µm wide, similar to those of pileipellis. Hymenophoral trama divergent, composed of septate, thin-walled and cylindrical hyaline in 4–17 µm diam. Clamp connections present.

Habitat: Gregarious to scattered, on the ground of subtropical broad-leaf forest dominated by Castanopsis.

Distribution: Currently only known from subtropical to tropical areas of China.

GenBank Accession: ITS: MN378313.

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

Basidiomata of Hygrophorus glutiniceps. a, b GDGM42140 c GDGM42154 d GDGM42188 (Holotype) e GDGM42217 f GDGM45220. Scale bars: 2 cm.