: generic delimitation with a multi-gene dataset.

and are two genera of closely related, ectomycorrhizal fungi in the order ; the former stipitate and the latter corticioid. Both are widespread in the Northern Hemisphere and many species from both genera seem to be restricted to old growth forest. This study aimed to: a) identify genetic regions useful in inferring the phylogenetic relationship between and , b) infer this relationship with the regions identified and c) make any taxonomic changes warranted by the result. , mtSSU and nearly full-length portions of nrLSU and nrSSU were found to be comparatively easy to sequence and provide a strong phylogenetic signal. A STACEY species tree of these three regions revealed that makes paraphyletic. As a result, nearly all species currently placed in were recombined to was found to be closer to than , but its placement needs further study and it was hence not recombined.