Boletaceae from Shanxi Province of northern China with descriptions of ten new species

The Boletaceae is a highly diverse group of organisms with both ecological and edible values. There are many studies on Boletaceae in China, but the area investigated is generally the region of sourthwestern and southern China. The knowledge of Boletaceae in northern China is limited. In this study, we surveyed the species diversity of Boletaceae in Shanxi Province, northern China. Molecular phylogenetic analyses were performed using a concatenated internal transcribed spacer of the nuc rDNA (ITS), the large subunit of nuclear ribosomal RNA gene (nrLSU), the translation elongation factor 1-alpha gene (tef1), and the second largest subunit of RNA polymerase II gene (rpb2) dataset (totally including 1 140 sequences from 409 collections). Our phylogenetic tree revealed 24 Boletaceae species from our collections, which are distributed in 16 genera, i.e. Boletus, Butyriboletus, Caloboletus, Chalciporus, Cyanoboletus, Hemileccinum, Hortiboletus, Leccinum, Neoboletus, Retiboletus, Rubroboletus, Strobilomyces, Suillellus, Tylopilus, Villoboletus, and Xerocomus. Of these species, 14 are identified as known species, including three new to China, and 10 are described and illustrated as new species in this paper. Accordingly, 15 species documented from Shanxi before this are discussed.