Panaeolus foenisecii J. Schrot.

Panaeolus foenisecii (Pers.) J. Schröt., Botaniste 17 (1–4): 187 (1926) Fig. 6 Basionym. Agaricus foenisecii Pers. 1800 Description. Pileus 7.6–17.6 mm in diam., parabolic, light brown (pantone 4685 c), brown (pantone 4645 c), glabrous, surface dry, hygrophanous especially at the margin, smooth, margin straight or slightly decurved. Lamellae adnate, subdistant, broad, mottled grayish to blackish, entire, edge white. Stipe equal, hollow, 24.1–47.3 mm long, 1.6–2.6 mm thick, brown, the same color as pileus, smooth, longitudinally striate, occasionally pruinose on the upper side, base with whitish mycelium. Basidiomes getting brown when handling, bruising, and cutting. Basidiospores 11.3–12.5 × 7.8–9.2 μm, [x = 11.8 ± 0.3 × 8.7 ± 0.3, Q = 1.3–1.5, Q m = 1.4 ± 0.1, n = 20], ellipsoid, punctate, verrucose, brown, reddish brown, thick wall with germ pore. Basidia 25.8–39.6 × 8.9–12.5 μm, 4 - spored, smooth, hyaline. Cheilocystidia 28.3–61.4 × 5.1–11.4 μm, narrowly clavate, with an inflated head and base, hyaline, smooth. Pleurocystidia absent. Cuticle composed of cellular or hymeniform cell, pileocystidia 22.1–79.2 × 12.3–50.5 μm, spheropedunculate, hyaline. Caulocystidia not observed. Habitat. Grows on fertile soil as pastures, grasslands, and forests. Psilocybin-producing. Nonproducing (ZRL 20210662, see Suppl. material 1: fig. S 6). Notes. Panaeolus foenisecii is characterized by its punctate to verrucose basidiospores. Specimens examined. China. Xizang Autonomous Region: Nyingchi Municipality, Zayü County, 29.20.1°N, 97.5.16°E, alt. 4230 m, 23 July 2021, Mao-Qiang He, ZRL 20210661, ZRL 20210662; Shigatse Municipality: Gyirong County, Gyirong Town, 28.22.39°N, 85.19.40°E, alt. 2780 m, 02 August 2022, Mao-Qiang He, ZRL 20220802.