Cyanescent Gyroporus (Gyroporaceae, Boletales) from China

Gyroporus species with cyanescent oxidation reactions were investigated, based on morphology and phylogenetic analysis of DNA sequences from the nuclear ribosomal large subunit (nrLSU), the nuclear ribosomal internal transcribed spacer (ITS) and the mitochondrial adenosine triphosphate ATP synthase subunit 6 (atp6). Three species, including two new species, namely G. alpinus and G. flavocyanescens and one previously-described species, namely G. brunneofloccosus, are revealed from China. Collections formerly reported from China as "G. cyanescens" are either G. alpinus or G. flavocyanescens. The new species are documented and illustrated in detail, while the concept of G. brunneofloccosus is refined with additional recently-collected materials. Additionally, the cyanescent species G. pseudomicrosporus, previously described from China, is shown to be a member of the genus Gyrodon, based on re-examination of the type specimen. A key to the cyanescent Gyroporus species from China is provided.