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Abstract
Polyporus accommodates morphologically heterogeneous species and is divided into six infrageneric groups based on macromorphological characters. On the other hand allied genera have macro- and microscopic characters similar to those of Polyporus. The phylogenetic relationships of Polyporus and allied genera were established from sequences of RNA polymerase II second largest subunit (RPB2), nuclear ribosomal large subunit (nucLSU) and mitochondrial ATPase subunit 6 (ATP6). The molecular phylogenetic trees confirmed that Polyporus is a polyphyletic genus and recognized six major clades (1–6) containing species of Polyporus and several allied genera. Among the clades one contained three infrageneric groups of Polyporus and two allied genera, Datronia and Pseudofavolus while one other contained group Polyporellus and Lentinus. Five of the six major clades contained species belonging to a single infrageneric group, Favolus, Melanopus, Polyporellus or Polyporus. This suggests that morphological characters used to define these groups have phylogenetic significance and reveals the need for a taxonomic revision of Polyporus and its allied genera.
The authors thank Prof R.H. Petersen (University of Tennessee), Dr H. Neda (FFPRI) and Dr C. Decock (MUCL) for kindly providing isolates. We are grateful for the help of Ms Y. Ando, Mr S. Ito, Mr S. Kurogi, Mr H. Sasaki, Mr S. Sato, Prof S. Tsujiyama (Kyoto Prefectural University), Mr E. Hatano, Ms A. Hatano, Ms M. Hattori and Dr T. Fukiharu (Natural History Museum and Institute, Chiba) in kindly providing specimens. The authors are grateful for the help of anonymous reviewers for comments on the manuscript. KS acknowledges financial support from the Japan Society for Promotion of Science. This research was supported by Research Fellowships for Young Scientists (No. 19-2260) from the Japan Society for the Promotion of Science ( JSPS).