Fissuracium ellipsoideum C. L. Zhao sp. nov.

Figs 3, 4, 5, 6

Chinese name.

椭圆孢硬撕裂革菌 (tuo yuan bao ying si lie ge jun).

Holotype.

China • Yunnan Province: Diqing, Weixi County, Weideng Town, Songpo Village, GPS coordinates: 27°5'N, 99°13'E, elevation: 1,600 m asl., on the fallen angiosperm branch, leg. C. L. Zhao, 13 October 2023, CLZhao 34584 (SWFC 00034584).

Etymology.

Ellipsoideum (Lat.): refers to the ellipsoid basidiospores.

Basidiomata.

Annual, resupinate, adnate, membranaceous, fragile, without odor or taste when fresh, up to 20 cm long, 2 cm wide, and 150 μm thick. Hymenial surface smooth, obviously cracking, cream when fresh, turning to pale yellow upon drying. Sterile margin narrow, cream to pale yellow, up to 1 mm.

Hyphal structure.

Monomitic; generative hyphae with clamp connections, colorless, thin-walled, frequently branched, loosely interwoven, 1.3–2.7 µm in diameter, IKI –, CB –; tissues unchanged in KOH.

Hymenium.

Cystidia absent. Cystidioles clavate with a slightly swollen apex, 26.3 × 2.2 µm. Basidia more or less pyriform, slightly flexuous, attenuate toward the base, thin-walled, smooth, with four sterigmata and a basal clamp connection, 12.8–23.5 × 4.8–6.6 µm; basidioles pyriform, but smaller than basidia; subhymenial hyphae covered with smaller irregularly-shaped colorless crystals.

Basidiospores.

Ellipsoid, colorless, thick-walled, smooth, with one guttule, IKI –, slightly CB +, (4.7 –) 5–6.3 (– 6.4) × (3.2 –) 3.4–4.2 (– 4.4) µm, L = 5.73 µm, W = 3.85 µm, Q = 1.44–1.53 (n = 60 / 2).

Type of rot.

White rot.

Additional specimen (paratype) examined.

China • Yunnan Province: Diqing, Weixi County, Weideng Town, Songpo Village, GPS coordinates: 27°5'N, 99°13'E, elevation: 1,600 m asl., on the fallen angiosperm branch, leg. C. L. Zhao, 13 October 2023, CLZhao 34498 (SWFC 00034498).