Galerina variibasidia T. Bau & X. L. Liu 2021, sp. nov.

Galerina variibasidia T. Bau & X.L. Liu sp. nov. (Figs. 2–5)

MycoBank number:—MB 839567

Diagnosis:—Pileus 8–15 mm diam, conical to paraboloid, yellowish ochraceous to pale brownish. Stipe 42–72 × 2–5 mm, cylindrical. Lamellae light ochraceous to light brown. Basidiospores 9.9–12.2 × 5.6–7.0 μm, amygdaliform, ellipsoid to elongated-ellipsoid, verrucose, light ocher-brown. Cheilocystidia 41–69 × 7–10 μm, lageniform to subfusiform, hyaline to yellowish. Basidia narrowly clavate, 24–35 × 8–11 μm, with three types of sterigmata: thornshaped, long pine needle-like, and 2-branched antler-shaped.

Etymology:—refers to the various shapes of basidia.

Types:— CHINA. Inner Mongolia Autonomous Region: Arxan National Forest Park, Hinggan League, 47° 18′ 50″ N, 120° 29′ 21″ E, elev. 743 m, 22 July 2019, Xiaoliang Liu, HMJAU58768 (holotype!); same location, 22 July 2019, Xiaoliang Liu, HMJAU58769 (paratype!).

Description:— Pileus 8–15 mm diam, conical to paraboloid or approximately campanulate when young, then gradually convex, some umbonate, surface smooth, dry, initially golden brown (5D7), oak brown (5D6) to raw Sienna (6D7) when mature, salmon (6A4) to flesh color (6B3) at the center, hygrophanous at the margin. Context thin, flesh color (6B3). Lamellae adnate, moderately sparse, flesh color (6B3), light brown (6D8) to brown (6C6). Stipe 42–72 × 2–5 mm, cylindrical, hollow, fragile, light brown to brown (6C6), dry, inconspicuously pruinose over the entire length (Figs. 2–3).

Basidiospores 9.9–12.2 × 5.6–7 μm, Q = 1.5–2.1, amygdaliform, ellipsoid to elongate–ellipsoid or narrowly ellipsoid to fusiform, brownish orange (6 C8) to light brown (6D8) in 5% KOH solution, verrucose, ornamentation consisting of low, broad, irregular warts, plage distinctive, dextrinoid (Figs. 4D, 5B). Basidia 24–35 × 8–11 μm, narrowly clavate, sterigmata variable, usually three forms: thorn-shaped, abundant, 2 or 4, 3–6 μm long (Figs. 4 Ef–g); long pine needle-like, 2 or 4, 10–27 μm long (Figs. 4 Ea–d); and 2-branched antler-shaped including two types, the first type with one bifurcate sterigma (Fig. 5D), another type with two branched sterigmata (Fig. 5D), both forking into antlers. Cheilocystidia numerous, 41–69 × 7–10 μm, thin-walled, densely packed at the edge, lageniform to subfusiform, ventricose near the base and gradually tapering towards the apex, tip blunt and rounded, mostly hyaline, occasionally light yellowish or near Pompeian yellow (5 C6) in 5% KOH solution. Pleurocystidia scattered, 45–62 × 8–11 μm, like the cheilocystidia. Pileipellis a cutis of interwoven hyphae, with cylindrical to inflated segments, 13–21 μm broad, thin-walled, hyaline, pileocystidia absent. Stipitipellis a cutis of interwoven hyphae. Caulocystidia 44–68 × 9–12 μm, like the cheilocystidia. Clamp connections numerous in all tissues.

Habitats:—Scattered, among moss on rotting coniferous stumps, in coniferous Larix sp. forest.

Distribution:— China.