The genus Fomitopsis (Polyporales, Basidiomycota) reconsidered

Based on seven- and three-gene datasets, we discuss four alternative approaches for a reclassification of Fomitopsidaceae (Polyporales , Basidiomycota) . After taking into account morphological diversity in the family, we argue in favour of distinguishing three genera only, viz . Anthoporia , Antrodia and Fomitopsis . Fomitopsis becomes a large genus with 128 accepted species, containing almost all former Fomitopsis spp. and most species formerly placed in Antrodia , Daedalea and Laccocephalum . Genera Buglossoporus , Cartilosoma , Daedalea , Melanoporia , Neolentiporus , alongside twenty others, are treated as synonyms of Fomitopsis . This generic scheme allows for morphologically distinct genera in Fomitopsidaceae , unlike other schemes we considered. We provide arguments for retaining Fomitopsis and suppressing earlier ( Daedalea , Caloporus ) or simultaneously published generic names ( Piptoporus ) considered here as its synonyms. Taxonomy of nine species complexes in the genus is revised based on ITS, ITS + TEF1 , ITS + TEF1 + RPB1 and ITS + TEF1 + RPB2 datasets. In total, 17 species are described as new to science, 26 older species are reinstated and 26 currently accepted species names are relegated to synonymy. A condensed identification key for all accepted species in the genus is provided.