Sistotrema sinense Q. Zhou & C. L. Zhao sp. nov.

Figs 15, 16, 17

Holotype.

China • Yunnan Province: Dali, Weishan County, Qinghua Town, GPS coordinates: 25°01′N, 100°22′E, altitude: 2071.6 m asl., on the fallen branch of angiosperm, leg. C. L. Zhao, 18 October 2022, CLZhao 24876 (SWFC).

Etymology.

sinense (Lat.): refers to the type locality (China).

Description.

Basidiomata annual, resupinate, adnate, soft coriaceous when fresh, becoming coriaceous upon drying, without odor or taste when fresh, up to 11 cm long, 2.5 cm wide, 50–100 µm thick. Hymenial surface smooth, white when fresh, turning to white to incanus upon drying. Sterile margin thin, white, thinning out, up to 1 mm wide.

Hyphal system monomitic, generative hyphae with clamp connections, often and characteristically with oil content, colorless, slightly thick-walled, frequently branched, interwoven, 2–4 μm in diameter; IKI –, CB –, tissues unchanged in KOH.

Cystidia and cystidioles absent. Basidia suburniform to urniform, slightly thick-walled, with 4 sterigmata and a basal clamp connection, 8–13.5 × 3–5 μm; basidioles abundant, in shape similar to basidia, but slightly smaller.

Basidiospores suballantoid to allantoid, colorless, thin-walled, smooth, IKI –, CB –, 3–4.5 (– 5) × (1 –) 1.5–2.5 μm L = 3.8 µm, W = 1.72 µm, Q = 2.21 μm (n = 30 / 1).