Two new species and one new record of Bolbitius (Bolbitiaceae, Agaricales) from northeast China

A taxonomic study of the genus Bolbitius from northeast China was conducted, based on morphological observations and molecular phylogenetic analyses. Phylogenetic relationships were reconstructed, based on a combined multi-locus dataset comprising the internal transcribed spacer (ITS), nuclear large subunit (nrLSU) and translation elongation factor 1 - α (tef 1 - α) sequences. As a result, two new species are described and illustrated: Bolbitius planoflavus, characterised by its distinctly applanate, pale yellow pileus when mature and the presence of occasional 2 - spored basidia; and Bolbitius fuscopapillatus, distinguished by its violet-brown papillate umbo and purplish-white margin bearing faint veil remnants.

Additionally, Bolbitius bisporus is reported as a new record for China. Detailed morphological descriptions, colour photographs and comparisons with closely-related taxa are provided.