A new species of Phlebopus (Boletales, Basidiomycota) from Mexico

A new species, Phlebopus mexicanus, is described from southern tropical rainforests of Mexico based on morphological and molecular characters. Several features distinguish this species from others of Phlebopus including the medium to small basidiomata with olivaceous brown tomentose pileus that becomes finely areolate cracked with age, the dark yellow brown pruina covering most of the stipe, the pale yellow flesh of pileus and stipe that slowly turns blue when exposed, and the lack of hymenial cystidia. Phylogenetic analyses using nLSU sequences support the recognition of this new morphological species in the Sclerodermatineae. Our analyses also suggest that P. portentosus and P. marginatus are not conspecific and relationships of Old World taxa of Phlebopus need further scrutiny. A key to all known New World taxa is provided.