Xenasma umbonatum (G. Cunn.) Hjortstam, Mycotaxon 54: 192. 1995.
Description：
Basidiocarp effuse, separable, farinaceous, 60-120 µm thick in section. Hymenial surface whitish or Ivory Yellow, smooth, not cracked; margin concolorous, rather determinate or thinning. Hyphal system monomitic; hyphae nodose-septate. Subiculum uniform, composed of medullary layer, with compact texture; hyphae colorless, indistinct, ± agglutinated, tor-tuous, 1.3-2.8 μm diam., thin-walled. Hymenial layer IKI brownish, CB+. Cystidia lacking. Basidioles always pleural, with swollen bases. Basidia always pleural, utriform, basally swollen, 40-52 × 7.7-9.5 μm , 4-sterigmate. Basidiospores subglobose, width exceeding the length, with a prominent apiculus, rugose or verrucose, thin-or slightly thick-walled, usually guttulate, 9-10.5 × 9.5-11.2 μm, IKI-, CB-.
Specimens：
Taiwan. Chiayi: Chuchi Hsiang, Fenchihu, alt. 1,500 m, on culm of bamboo, 8 Sep 1988, Wu 880908-1 (GB, H, LY, TNM), Wu 880908-4 (H, L, TNM).
Habitat：
null
Distribution：
New Zealand, France, Taiwan.
References：
Wu, SH. 1990.
Provided：
S. H. Wu
Note：
The species is characterized by a thin basidiocarp, which is made up of compact subiculum, pleural basidia, and large rugose- or verrucose-walled basidiospores.
Phylum：Basidiomycota >> Class： Basidiomycetes >> Order： Polyporales 
BCRC Number：