Fibrodontia alba sp. nov. (Basidiomycota) from Taiwan

• New species Fibrodontia alba was found at the foothills in central Taiwan.
• Phylogenetical study based on ITS and 28S rRNA gene placed F. alba in F. gossypina complex.
• Main differences of F. alba from F. gossypina are in morphology of skeletal-like and subicular hyphae.
• The position of F. brevidens within Fibrodontia, based on rRNA gene sequences, was proved for the first time.

Fibrodontia alba sp. nov. is described from central Taiwan. Its major diagnostic features are white, minutely and densely aculeate hymenial surface, colorless generative hyphae, colorless, in mass pale colored, narrow, moderately encrusted skeletal-like hyphae in aculeal trama and ellipsoid basidiospores. Bayesian inference of the phylogeny based on internal transcribed spacer (ITS) and partial 28S nuclear ribosomal RNA gene sequences showed that phylogenetic distance between F. alba and F. gossypina is near equal to the distance between morphologically well-delimited species, F. gossypina and F. brevidens. Morphology description, basidiomata photographs, micromorphology drawings and scanning electron microscopic images of crystalline deposits on skeletal-like hyphae, are provided for the new species. A key to the all known species of Fibrodontia is provided.