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Melanomphalia thermophila(Sing.) Sing. is a rarely collected agaric previously known only from Florida and Brazil. This taxon was originally described as a species of Tubariaand much of Singer's rationale for placing Tubariawithin the Crepidotaceae (Imai) Sing. was based on anatomical similarities between T. thermophilaand Crepidotus(Fr.) Staude. In later works, T. thermophilawas transferred to MelanomphaliaM.P. Christ., again forming the basis upon which Singer placed Melanomphaliawithin the Crepidotaceae. Based on examination of newly collected specimens from Puerto Rico and Panama, type studies, and nuclear large subunit rDNA analysis, we conclude that this taxon is, in fact, a centrally stipitate Crepidotus. Melanomphalia thermophilais transferred to Crepidotus, fully described and illustrated.