Studies in Perenniporia. Perenniporia contraria and its presumed taxonomicsynonym Fomes subannosus

The type specimens of Perenniporia contraria and of its presumed taxonomic synonym, Fomes subannosus, have been revisited. In addition, some recent co llections identified as Fi contraria have been re-examined, demonstrating t l lat the present concept of the latter taxon is confused. The species is i llustrated and its concept redefined. Fomes subannosus, though closely rela ted to P. contraria, is recognized as a distinct taxon on account of basidi ocarp shape, pore size and the width of skeletal hyphae. The taxonomic plac ement of both taxa is discussed. Both species are endemic to neotropical Am erica. All other specimens examined and originating from other continents b elong to different taxa.