Molecular and morphological data reveal two new polypores (Polyporales, Basidiomycota) with reddish brown to orange basidiomata from China

Two taxonomically controversial polypore genera with reddish brown to orange basidiomata that stain reddish with KOH solution, Aurantiporus and Hapalopilus, are revised based on additional sampling, morphological examination, and phylogenetic analysis of a combined dataset of ITS1-5.8S-ITS2-nLSU sequences. Hapalopilus is a monophyletic genus belonging to Phanerochaetaceae, whereas Aurantiporus is a polyphyletic genus belonging to Meruliaceae. Hapalopilus and Aurantiporus s. str. are circumscribed, and two new species – Aurantiporus orientalis and Hapalopilus tabuliformis – are described and illustrated from temperate China. In addition, four new combinations, viz. Aurantiporus alboaurantius, A. mutans, A. tropicus and Luteoporia albocitrina, are proposed based on morphology and phylogenetic analysis. The relationships between Aurantiporus and Hapalopilus are discussed.