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The fungus currently known as  Laetiporus persicinus  is a recognizable brown-rot decayer that is widespread on oak hosts in the southeastern United States. This species was first described as  Polyporus persicinus  in 1872 based on collections by Henry W. Ravenel from South Carolina. In this study, we elucidate the phylogenetic relationships of  Laetiporus persicinus  based on maximum likelihood and Bayesian inference analyses of a four-locus data set (18S, 28S,  rpb2 , and  tef1 ) from taxa within the Fomitopsidaceae and Laetiporaceae. The internal transcribed spacer (ITS) region was analyzed separately because it was not possible to align this locus across a diverse data set that included taxa from multiple families. Our analysis and previous studies indicate that  Laetiporus persicinus  does not belong to  Laetiporus  sensu stricto, and we found a strongly supported relationship between  Laetiporus persicinus  and the African species  Kusaghiporia usambarensis , despite the fact that the 28S phylogeny resolved a different (but unsupported) topology. Here, we propose  Kusaghiporia persicinus , comb. nov., based on a combination of morphological and molecular data.  Laetiporus persicinus  shares many morphological features with  K. usambarensis  that are missing in other  Laetiporus  species, including centrally stipitate basidiomata, a brown to pinkish pileus surface, and a pore layer that bruises when touched. However,  K. usambarensis  and  L. persicinus  differ in basidiospore size and shape as well as their geographic distributions. We provide a revised taxonomic treatment for this common wood-decay fungus.

Revising the taxonomic placement of Laetiporus persicinus within the Laetiporaceae