Pluteus ochroviridans sp. nov., belonging to Pluteus sect. Celluloderma (Pluteaceae) from Mediterranean habitats in Spain and California (USA)

Pluteus ochroviridans sp. nov. is described based on collections made in Spain and California (USA). This species is characterized by a strongly hygrophanous, brown, gray-brown to yellow-brown pileus that develops green tones, and by its terrestrial habitat in Mediterranean ecosystems. Phylogenetic analyses of ITS and TEF1-α sequences separate this species from closely related taxa: P. californicus, P. olivaceus, and P. phaeocyanopus. We obtained sequences from the type collections of these three closely related taxa, thus establishing DNA reference data for the modern taxonomic concepts of these species. A full description, illustrations, and phylogenetic analysis results of the new species are provided.