Additions to neotropical stereoid fungi (Polyporales, Basidiomycota): one new species of Lopharia and one new combination in Phlebiopsis

Stereoid fungi are an artificial group with mostly effused-reflexed to stipitate basidiomata, smooth hymenophore, and hyaline spores. From recent surveys in the Brazilian Atlantic Forest, Caatinga, and Cerrado, six specimens of this group had their identity tested with the nrITS and nrLSU sequences. Two of them were nested within the Lopharia s.s. clade and represent a new species L. erubescens, characterized by the dextrinoid reaction of the cystidia, and small basidia and spores. The other four were initially identified as Hjortstamia amethystea, but nested in the Phlebiopsis clade. Thus, we proposed the new combination, Phlebiopsis amethystea. We also provide keys to neotropical Lopharia s.l. and Phlebiopsis s.l. and allied species.