Morphological characters and phylogenetic analysis reveal a new species of Phellinus with hooked hymenial setae from Vietnam

Phellinus vietnamensis sp. nov. is described from Vietnam based on morphological characters and molecular data. Morphologically, it is characterized by perennial, pileate basidiomata, a dimitic hyphal system, hooked hymenial setae, and colorless, broadly subglobose to ovoid, thick-walled basidiospores 5.5-6 x 4.8-5.2 mu m. Phylogenetically, the status of Phellinus vietnamensis is strongly supported based on sequences of the nuclear internal transcribed spacer (ITS) regions, the translation elongation factor 1-alpha gene (EF1-alpha) nuclear large subunit rDNA (nrLSU) and the second largest subunits of RNA polymerase II (RPB2).