Peniophorella albohymenia Y. L. Deng & C. L. Zhao 2025, sp. nov.

Peniophorella albohymenia Y. L. Deng & C. L. Zhao sp. nov. Figs 11, 12, 13 Holotype. China • Yunnan Province, Zhaotong, Xiaocaoba Town, Wumengshan National Nature Reserve, GPS coordinates: 27°33'N, 103°27'E, altitude 2300 m asl., on fallen angiosperm branch, leg. C. L. Zhao, 19 September 2023, CLZhao 33187 (SWFC). Etymology. Albohymenia (Lat.): referring to “ albus ”, the distinctive white hymenium of the type specimen when fresh. Diagnosis. Peniophorella albohymenia is characterized by the membranaceous basidiomata with white hymenial surface, four types cystidia as stephanocyst, fusiform, cylindrical and capitate, and ellipsoid basidiospores measuring 9–10.9 × 4.5–5 µm. Description. Basidiomata annual, resupinate, adnate, membranaceous, without odor or taste when fresh, up to 4.5 cm long, 1 cm wide, and 0.1 mm thick. Hymenial surface smooth, white when fresh and dry. Sterile margin distinctly, thin, white, up to 1 mm long. Hyphal system monomitic; generative hyphae with clamp connections, thin-walled, colorless, occasionally branched, 2.5–4 µm in diameter, IKI –, CB –, tissues unchanged in KOH. Cystidia of four types: (1) stephanocyst, thin-walled, 9–18 × 7–8 µm; (2) fusiform cystidia, smooth, thin-walled, 29–31 × 7–9 µm; (3) cylindrical cystidia, thin-walled, slightly constricted at the neck, the apical part encrusted with asteroid, 27–64 × 5–11 µm; (4) capitate cystidia, thin-walled, the apical part encrusted with asteroid, 22–47 × 5–12 µm. Basidia clavate, with four sterigmata and a basal clamp connection, colorless, thin-walled, 20–28 × 7.5–9 µm; basidioles in shape similar to basidia, but slightly smaller. Basidiospores ellipsoid, colorless, thin-walled, IKI –, CB –, (8.5 –) 9–10.9 (– 11.2) × (4.4 –) 4.5–5 (– 5.5) µm, L = 9.87 µm, W = 4.93 µm, Q = 1.99–2.02 (n = 60 / 2). Another specimen (paratype) examined. China • Yunnan Province, Zhaotong, Xiaocaoba Town, Wumengshan National Nature Reserve, GPS coordinates: 27°33'N, 103°27'E, altitude 2300 m asl., on fallen angiosperm branch, leg. C. L. Zhao, 19 September 2023, CLZhao 33257 (SWFC). Notes. Our results indicate that the new species P. albohymenia was placed within Peniophorella inferring from the dataset of ITS + nLSU (Figs 1, 4). Morphologically, the species P. albohymenia is similar to P. daweishanensis J. H. Dong & C. L. Zhao and P. yunnanensis C. L. Zhao by having capitate cystidia, but P. daweishanensis is distinct from P. albohymenia by its buff to slightly yellowish, reticulate hymenial surface and longer basidia (31.5–38 × 7–9 µm; Dong et al. 2024). P. yunnanensis differs from P. albohymenia due to its grandinioid hymenial surface (Guan et al. 2020).