Rhacophyllus and Zerovaemyces - teleomorphs or anamorphs?

The originally monotypic genus Rhacophyllus was conceived for an agaric-lik e fungus that bore sheets of miniature sclerotium-like bodies (lysomeres) i n place of lamellae. Subsequently it was demonstrated that a "normal" Copri nus-like teleomorph exists as an alternative state (morph). Following this discovery, most authors have treated Rhacophyllus as an anamorph. Ontogenet ic studies indicate that the Rhacophyllus state is a variation on basidiome production. Rhacophyllus apparently was rediscovered and redescribed as a new genus Zerovaemyces, for which a new family, Zerovaemycetaceae, and a ne w order, Loculomycetes, were also described, all as teleomorphs. Nomenclatu ral application of these names are analysed, and it is concluded that Rhaco phyllus (and Zerovaemyces, Zerovaemycetaceae) are best considered to be nom ina anamorphosium. These decisions affect the naming of other taxa newly re solved molecularly. An analogous second case of modified basidiomes involve s the anamorph Decapitatus gen. nov., described here for the well-known gem miferous state of Mycena citricolor, Decapitatus flavidus comb, nov. (= Sti lbum flavidum).