Attamyces is a fungal genus in the family Agaricaceae. This is a monotypic genus, containing the single species Attamyces bromatificus. The fungus was found fruiting on the nest of the fungus-growing ants Atta insularis in Cuba. Both the species and genus were described by German mycologist Hanns Kreisel in 1972. The specific epithet bromatificus refers to bromatia, which are swollen tips on the hyphae that the ants use as food.