Fragiliporiaceae, a new family of Polyporales (Basidiomycota)

Abstract

Fragiliporiaceae fam. nov., a new poroid wood- inhabiting family, is introduced based on the combination of molecular and morphological data, and is typified by Fragiliporia gen. nov. The phylogenetic analysis shows that Fragiliporia fragilis sp. nov. forms a monophyletic group within Polyporales and warrants the introduction of a new fragiliporia clade based on molecular data of ITS+nLSU rRNA gene regions. Combined ITS, nLSU, mtSSU, TEF1 and RPB2 sequence data also demonstrated that the new family Fragiliporiaceae also formed a monophyletic lineage (70 %B S, 57 %B P, 0.99 BPP), and grouped with the phlebioid clade, residual polyporoid cladeandcore polyporoid clade. Fragiliporiaceae has unique macromorphological char- acters in having resupinate basidiocarps with very soft tubes when fresh, which become brittle when dry (becoming almost powdery when bruised); a monomitic hyphal system with thick-walled generative hyphae, clamp connections, and fre- quently H-, W- or Y-shaped hyphae branching from the clamp connections.