Basidiocarp effuse-reflexed to pileate, often imbricate, soft when fresh, harder and ± wrinkled when dried. Pileus upper surface yellow to pale brown, occasionally tinted white owing to the overgrowing thin layer of white mycelia, generally glabrous. Context whitish yellow, fairly thin. Hymenial surface brownish, eventually hydnoid. Spines fairly crowded, separate or fused, subulate, flat, up to ca. 7 mm long, 150-500 μm wide. Hyphal system monomitic; hyphae simple-septate. Context usually with dense texture; hyphae guttulate, colorless, generally 2.5-5 μm diam., occasionally up to 8 μm diam., thin-walled. Inner parts of spines with dense texture; hyphae vertically arranged, colorless, 2-4 μm diam., sometimes somewhat wider, thin-walled. Cystidia lacking. Basidia subclavate, usually guttulate, 25-33 × 3.7-4.7 μm, 4-sterigmate. Basidiospores in general very numerous, ellipsoid, adaxially flattened, yellow or brownish yellow, smooth, slightly to distinctly thick-walled, 3.8-5 × 2.5-3 μm, dextrinoid, cyanophilous.
Specimens：
Taiwan. Nantou: Liehnuachih, alt. 700 m, on rotten wood of angiosperm, 5 Jul 1993, Zang 11975 (TNM); 16 Jun 1994, CWN 00555 (TNM), CWN 00619 (TNM). Pintung: Kenting, Chufengshan, alt. 200 m, on trunk of dead angiosperm, 31 Aug 1994, Wu 9408-7 (TNM).
Habitat：
null
Distribution：
Uncertain, because delimitation of this species is not yet settled. Known collections of this species group were made from several islands in the south-western Pacific Ocean.
References：
Wu, SH. & Chou, WN. 1995.
Provided：
S. H. Wu
Note：
Gyrodontium is a tropical-subtropical genus, according to the distribution of member species. Gyrodontium is evidently a genus with a very restricted number of species, and Maas Geesteranus (1964) considered many names as synonyms.
Phylum：Basidiomycota >> Class： Basidiomycetes >> Order： Boletales 
BCRC Number：