Phylogeny and global diversity of Polyporus group Melanopus (Polyporales, Basidiomycota)

DAI Y.-CH; XUE H.J.; VLÁSAK J.; RAJCHENBERG M.; WANG B.; ZHOU L.B.

FUNGAL DIVERSITY

KUNMING UNIV SCIENCE & TECHNOLOGY

Lugar: Dordrecht; Año: 2014 vol. 63 p. 133 - 144

1560-2745

Polyporus accommodates species bearing stipitate basidiocarps, a dimitic hyphal system with skeleto-binding hyphae, and hyaline, thin-walled, more or less cylindrical basidiospores. The species of Polyporus are divided into six morphological groups, of which Melanopus is characterized by coriaceous basidiocarps, thin context and a black cuticle on the stipe. In this study, we explored the phylogeny and species diversity of Polyporus sensu lato focusing on the group Melanopus based on global samples. Our combined ITS and nLSU dataset included 117 collections represented by 117 ITS and 94 nLSU sequences, among which 43 ITS and 37 nLSU sequences were newly generated. The phylogeny recovered four clades, Favolus, Neofavolus, Melanopus and Polyporellus clades, while several species in the groups Melanopus and Polyporus were separated from these clades. Combined with morphological evidence, three new species Polyporus americanus, P. austroandinus and P. conifericola in the Melanopus clade are newly described and illustrated, and their distinct characters are discussed. The illegitimate name Polyporus fraxineus is renamed as Polyporus fraxinicola. The phylogeny and taxonomy of each species in the group Melanopus (morphology) or Melanopus clade (phylogeny) and related species are briefly discussed.