Stropharia daliensis Y. L. Feng, Y. Fang & X. Guo 2025, sp. nov.

Stropharia daliensis Y. L. Feng, Y. Fang & X. Guo, sp. nov. Figs. 2 & 3. Fungal Names No.: FN 572109. Diagnosis: — Differs from S. albonitens (Fr.) Quél. by its pileus that surface light reddish-brown to reddish-orange, covered with white to light yellow squamules, pleurocystidia and cheilocystidia abundant. Etymology: — daliensis (Lat.) refers to the type locality, Dali Bai Autonomous Prefecture. Holotype: — CHINA, Yunnan Province, Dali Bai Autonomous Prefecture, Cangshan Nature Reserve, GPS coordinates: 25°39′57″N, 100°9′21″E, elev. 2278 m, 17 July 2024, KEF 12933 (GenBank: ITS: PQ459866 and nrLSU: PQ459867). Description: — Basidiomata medium-sized. Pileus 2.2–5.0 cm in diam, convex at the early stage, gradually the edge of the pileus upturned at maturity, viscid to glutinous especially when young and wet, surface light reddish-brown (8E8) to reddish-orange (7A8), gradually becoming light reddish-orange (5B4–5B6), covered with white (1A1) to light yellow (1A3) squamules, the margins with partial veil remnants. Lamellae adnexed with decurrent teeth, crowded, gray (1B1-1C1), with 1–3 lamellulae of different lengths. Stipe 2.0–4.5 × 0.5–0.9 cm, central, cylindrical, spongy within, sometimes becoming hollow, white (1A1) to light yellow (1A3), evanescent annulus in the upper part of the stipe, below the annulus densely covered light yellow (1A3) triangular squamules. Spore print reddish-brown (8E8). Basidiospores elliptical, smooth, thin-walled, single, with an obvious germ-pore, contains 1–2 guttulatus, brown in 5 % KOH, unchanged in Melzer’s reagent, (5.8–)6.1–7.2 × 3.1–4.2(–4.5) μm, L = 6.38 µm, W = 4.12 µm, Q = (1.32–)1.35–1.56(–1.60), Q m = 1.51±0.14. Basidia clavate, with 2–4 spored, hyaline, thin-walled, inamyloid, 22.5–33.9 × 6.2–7.2 μm, sterigmata 3.2–3.7 µm, clavate, smooth, thin-walled, inamyloid. Pleurocystidia 26.7–30.2 × (6.6) 7.1–7.5 μm, clavate, colorless, with short mucronate apex and granular yellow contents. Cheilocystidia abundant, 32.6–52.8 × 8.1–11.2 μm, narrowly clavate, with capitate apex. Pileipellis formed by prostrate, hyaline, thin-walled, 10–17 µm wide. Clamp connections are present in the lamellae and the annulus. Habitat and distribution: —Gregarious on rotten wood or in forest litter dominated by Pinus yunnanensis Franch. and Pinus armandii Franch. Currently known from Yunnan Province, southwestern China. Additional specimens examined (paratype): CHINA, Dali Bai Autonomous Prefecture, Yanghe Tea Factory, GPS coordinates: 25°37′18″N, 100°11′28″E, elev. 2281 m, 17 July 2024, KEF 12934.