Luteoporia straminea Authority.

MycoBank number: MB 843318; Index Fungorum number: IF 843318; Facesoffungi number: FoF 12684;


Basidiomata annual, resupinate, ceraceous, without odor or taste, when fresh, becoming hard upon drying, up to 12 cm long, 6.5 cm wide, 200–400 µm thick. Hymenophore odontioid, buff to slightly straw when fresh, straw to pale orange upon drying, tissue becoming reddish in KOH. Sterile margin narrow, slightly straw. Hyphal structure monomitic; generative hyphae clamped, colorless, thin- to thick-walled, IKI–, CB–; tissues unchanged in KOH. Subicular hyphae unbranched, 3–5 μm in diameter; subhymenial hyphae unbranched, 2–4 μm in diameter; the presence of numerous yellow to yellowish brown gelatinous substances below subhymenium. Hymenium cystidia subuliform, colorless, thick-walled, covering with small yellowish crystal, 24.1–37.9 × 4.1–5.3 μm, cystidioles absent; basidia clavate, with four sterigmata and a basal clamp connection, 17.5–24.1 × 2.7–4.2 μm. Basidiospores ellipsoid, colorless, thin-walled, smooth, often with 1 oil drop, IKI–, CB–, (3.7–)4–4.6(–4.8) × (2–)2.2–3(–3.2) μm, L = 4.24 µm, W = 2.55 µm, Q = 1.57–1.69 (n = 90/3).

Material examined: China, Yunnan Province, Honghe, Pingbian County, Daweishan National Nature Reserve, E 102°06′, N 22°49′, alt. 1800 m, on the angiosperm trunk, 9 Jun 2020, C.L. Zhao, CLZhao 18947 (SWFC).

Distribution: The species is known from Yunnan Province, China, in a subtropical evergreen broad-leaved forest. It grows on moderately decayed angiosperm wood and causes white rot.

Sequence data: ITS: MW732407 (ITS5/ITS4); LSU: MW724799 (LROR/LR7); mtSSU: MW732765 (MS1/MS2)

Notes: Luteoporia straminea is sister to L. lutea (G. Cunn.) C.C. Chen & Sheng H. Wu (Fig. 2), but the latter differs in its golden yellow basidiomata, presence of slightly thick-walled fusoid cystidioles, and slightly thick-walled, ellipsoid basidiospores (Chen et al. 2021).

Fig. 1 Basidioma of Luteoporia straminea (holotype). — Scale bars: A = 1 cm, B = 1 mm.

Fig. 2 Microscopic structures of Luteoporia straminea (drawn from the holotype). A. Basidiospores; B. Basidia and basidioles; C. Cystidia; D. A section of hymenium. — Scale bars: A = 5 μm, B–D = 10 μm.