Rhodotorula hasegawae IFO 1058 (holotype) with the major ubiquinone system, Q-10(H2), produces the teleomorph from a single cell without mating. Its apparent life cycle is presented here. It is concluded that this fungus is related to the filobasidiaceous yeasts in the Basidiomycotina since it lacks probasidia (teliospores) and phragmobasidia bearing sessile basidiospores that are not forcibly discharged. Therefore, R. hasegawae is transferred to a new teleomorph-genus Erythrobasidium placed in the family Filobasidiaceae, as Erythrobasidium hasegawae (Yamada et Komagata) Hamamoto, Sugiyama et Komagata, comb. nov.