Crystallicutis albomarginata Z. R. Gu & C. L. Zhao 2025, sp. nov.

Crystallicutis albomarginata Z. R. Gu & C. L. Zhao sp. nov. Figs 5, 6, 7 Diagnosis. Differs from other Crystallicutis species by its slightly pink to orange basidiomata when dry, a monomitic hyphal system with simple septa, and narrowly ellipsoid basidiospores measuring 3.7–4.4 × 1.9–2.8 µm. Holotype. China • Yunnan Province, Zhaotong, Wumengshan National Nature Reserve, GPS coordinates: 22°77'N, 104°29'E, altitude 1800 m asl., on the fallen angiosperm branch, leg. C. L. Zhao, 25 August 2023, CLZhao 31506, GenBank: ITS = PV 470539, nLSU = PV 474184 (SWFC). Etymology. Albomarginata (Latin or Greek origin): refers to the white margin of the basidiomata. Description. Basidiomata. Annual, resupinate, adnate, membranaceous, without odor or taste when fresh, up to 10 cm long, 2.5 cm wide, and 200 μm thick at center. Hymenial surface smooth, cream to pale pink when fresh, turning to slightly pink to orange upon drying. Sterile margin narrow, cream to pale pink, up to 1 mm. Hyphal system. Monomitic; generative hyphae with simple septa, colorless, thin- to slightly thick-walled, rarely branched, interwoven, 2.1–3 µm in diameter, IKI –, CB –; tissues unchanged in KOH. Hymenium. Cystidia fusiform, colorless, thin-walled, smooth, 12.5–27 × 3.5–6 µm. Basidia clavate, thin-walled, smooth, slightly flexuous, with four sterigmata and a simple septum at the base, 12.1–19.4 × 3.8–6 µm; basidioles in shape similar to basidia, but slightly smaller; subhymenial hyphae covered with smaller irregularly shaped colorless crystals. Basidiospores. Basidiospores narrowly ellipsoid, colorless, thin-walled, smooth, with 1-2 guttules, IKI –, CB –, (3.5 –) 3.7–4.4 (– 4.6) × (1.6 –) 1.9–2.8 µm, L = 4.06 µm, W = 2.33 µm, Q = 1.58–1.95 (n = 60 / 2). Additional specimen examined (paratype). China • Yunnan Province, Zhaotong, Wumengshan National Nature Reserve, GPS coordinates: 22°77'N, 104°29'E, altitude 1800 m asl., on the fallen angiosperm branch, leg. C. L. Zhao, 25 August 2023, CLZhao 31409, GenBank: ITS = PV 470538, nLSU = PV 474183 (SWFC).