Phaeocollybia chefensis sp. nov. and new synonyms for P. rifflipes, P. rufotubulina, and P. tibiikauffmanii

Phylogenetic analyses of ITS and RBP2 sequence data from Phaeocollybia collections made at Cascade Head Experimental Forest in Oregon support recognition of a new species, P. chefensis. Collections of the new species were previously referred to P. tibiikauffmanii. Sequence analyses also establish that P. tibiikauffmanii is a synonym of P. spadicea, P. rifflipes is a synonym of P. lilacifolia, and P. rufotubulina is a synonym of P. californica. A revised general key to Pacific Northwest Phaeocollybia species is provided.

Automated summary

Phylogenetic analyses of ITS and RBP2 sequence data from Phaeocollybia collections in Cascade Head Experimental Forest, Oregon, support the identification of a new species, P. chefensis, and establish synonymies among several other species. A revised general key to Pacific Northwest Phaeocollybia species is also provided.