Description. Basidiocarps annual, effused, adnate, ceraceous, somewhat brittle, 50–200 μm thick in section (aculei excluded). Hymenial surface initially buff, with age turning ochraceous to pale brown, no colour changes in KOH, tuberculate to grandin- ioid when young, becoming odontioid to hydnoid with age, extensively cracked; mar- gin paler to whitish, fairly determinate. Aculei conical to cylindrical, usually separate, with obtuse to acute apex, 1–4 per mm, up to 100–700 × 100–250 μm.
Hyphal system basically monomitic, some specimens with quasi-binding hyphae near substratum; generative hyphae simple-septate. Subiculum fairly uniform, com- posed of a basal layer of compact texture; generative hyphae mainly horizontal, col- ourless, 4–6 μm diam., with 0.8–1 μm thick walls; quasi-binding hyphae sometimes present near substratum, colourless, 1–3 μm diam. Hymenial layer thickening, with compact texture, generative hyphae somewhat vertical, colourless, 3–6 μm diam., slightly thick-walled. Trama of aculei of compact texture; generative hyphae mainly vertical, other features similar to those in subiculum; crystal masses present near apex. Cystidia lacking, but projecting hyphal ends in the hymenium may be present. Ba- sidia clavate, 14–18 × 4.5–5.5 μm, 4-sterigmate. Basidiospores narrowly ellipsoid to cylindrical, adaxially slightly concave, smooth, thin-walled, homogeneous, inamyloid, non-dextrinoid, acyanophilous, 6–8.1 × 2.5–3.3 μm (Table 2). See also Wu (2000) for descriptions and illustrations.
Habitat. On fallen branches of angiosperms or gymnosperms.
Distribution. Hitherto known from subtropical to temperate regions of China (Yunnan), Japan, Taiwan and Vietnam.