Hymenochaete zhashuiensis L. L. Wan, L. S. Zhang, Shun Liu & B. K. Cui 2026, sp. nov.

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Hymenochaete zhashuiensis L. L. Wan, L. S. Zhang, Shun Liu & B. K. Cui sp. nov. Figs 4, 5 Diagnosis. Hymenochaete zhashuiensis is characterized by resupinate to effused-reflexed basidiomata, a reddish brown to rust-brown, uneven to tuberculate and locally cracked hymenial surface, a monomitic hyphal system with simple-septate, pale yellowish, slightly thick-walled generative hyphae, abundant dark brown, thick-walled hymenial setae (66–89 × 7.8–11 µm), branched dendrohyphidia, and ellipsoid to broadly ellipsoid basidiospores (4–5.6 × 2.8–3.5 µm). Type. • China; Shaanxi Province, Zhashui County; 33.807836°N, 108.951155°E; elevation 1184.0 m; on living angiosperm tree; 27 September 2025; Cui 24846 (holotype, BJFC). Etymology. “ zhashuiensis ” (Lat.): referring to Zhashui County, where the type specimen was collected. Description. Fruiting body. Basidiomata annual, resupinate to effused-reflexed, broadly attached to the substrate, coriaceous to woody when fresh, becoming hard upon drying, 15–20 cm long, 8–12 cm wide, 0.5–3 mm thick. Reflexed part dark brown to blackish brown, rough, uneven, partly covered by mosses and algae in the field. Hymenial surface reddish brown to rust-brown when fresh, becoming dark reddish brown upon drying, uneven, tuberculate to rugose, locally cracked; margin irregular, thinning out, concolorous to slightly paler than the hymenial surface. Tomentum present; cortex absent; hyphal layer present; setal layer well developed. Hyphal structure. Hyphal system monomitic; generative hyphae simple-septate, IKI –, CB –; tissues darkening in KOH. Subiculum. Generative hyphae pale yellowish, slightly thick-walled, frequently branched, interwoven, simple-septate, 1.7–2.3 µm in diam. Hymenium. Hymenial setae abundant, dark brown, thick-walled, fusiform to subulate, straight to slightly curved, with acute apices, projecting from or embedded in the hymenium, 66–89 × 7.8–11.0 µm. Embedded hymenial setae present; true setal hyphae not observed. Cystidia not observed. Dendrohyphidia present, branched, yellowish brown to brown, thin- to slightly thick-walled. Basidia narrowly clavate to subclavate, with four sterigmata and a simple septum at the base, 14.3–17.2 × 2.9–4.1 µm. Basidioles similar to basidia in shape, but smaller. Spores. Basidiospores ellipsoid to broadly ellipsoid, hyaline, thin-walled, smooth, IKI –, CB –, 4–5.6 × 2.8–3.5 µm, L = 4.71 µm, W = 3.19 µm, Q = 1.28–1.84 (n = 30 / 1). Type of rot. White rot.

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