Panaeolus subfoenisecii M. Q. He & R. L. Zhao, sp. nov.

Panaeolus subfoenisecii M. Q. He & R. L. Zhao sp. nov. Fig. 13 Etymology. sub refers to it being morphologically the same and phylogenetically close to P. foenisecii. Diagnosis. Panaeolus subfoenisecii is phylogenetically sister to P. foenisecii but has smooth basidiospores. Holotype. CHINA. Xizang Autonomous Region: Shigatse Municipality, Gyirong County, Gyirong Town, 28.22.39°N, 85.19.40°E, alt. 2780 m, 02 August 2022, Mao-Qiang He, HMAS 287492 (ZRL 20220850). Description. Pileus 10.6–15.5 mm in diam., obtusely conic, brown (pantone 2470 c), disc darker (pantone 2469 c), hygrophanous, sometimes paler at margin, surface dry, radially rugulose, margin straight or decurved. Lamellae adnate, subdistant, broad, mottled grayish to blackish, entire, edge white. Stipe equal, hollow, 43.0– 52.1 mm long, 1.0–2.0 mm thick, brown, the same color as pileus (pantone 2469 c), smooth, longitudinally striate, pruinose on the side close to the cap, base with whitish mycelium. Basidiospores 11.1–12.8 × 6.5–8.3 μm, [x = 12.2 ± 0.5 × 7.5 ± 0.1, Q = 1.4–1.8, Q m = 1.6 ± 0.1, n = 20], ellipsoid, smooth, brown, blackish brown, thick wall with germ pore. Basidia 17.1–23.9 × 8.5–11.7 μm, 4 - spored, smooth, hyaline. Cheilocystidia 14.4–43.6 × 3.1–7.7 μm, cylindro-clavate, with lightly inflated head and base, hyaline, smooth. Pleurocystidia absent. Cuticle composed of large vesicles, pileocystidia not observed. Caulocystidia absent. Habitat. Grows on fertile soil as pastures and grasslands. Psilocybin-producing. Producing (ZRL 20220850, Suppl. material 1: fig. S 8). Notes. Panaeolus subfoenisecii is phylogenetically close to and macromorphologically resembles P. foenisecii. The two species can be separated under the microscope in that P. subfoenisecii has smooth basidiospores, whereas P. foenisecii has verrucose basidiospores. Specimen examined. China. Xizang Autonomous Region: Shigatse Municipality, Gyirong County, Gyirong Town, 28.22.39°N, 85.19.40°E, alt. 2780 m, 02 nd August 2022, Mao-Qiang He, ZRL 20220801.