Abstract
SUMMARY Rhodosporidium sphaerocarpum Newell & Fell, sp. nov., is described as the perfect form of marine-occurring strains of Rhodotorula glutinis (Fres.) Harrison. Both asexual yeast and sexual mycelial phases are described and compared to those of Rhodosp. toruloides Banno, the type species of the genus. The genus Rhodosporidium was described by Banno (1967) to include the perfect form of strains of the red-pigmented, anascosporogenous yeast species Rhodotorula glutinis (Fres.) Harrison. Banno named this sexual fungus Rhodosp. toruloides. He discovered the sexual stages among atmospheric and terrestrial strains of Rhodotorula maintained in the collection at the Institute for Fermentation at Osaka, Japan. The life cycle of Rhodosp. toruloides, as described by Banno and confirmed by us, is as follows: haploid yeast phase-> conjugation, plasmogamy -> dikaryotic mycelium with clamp connections --> thickwalled dikaryotic teliospore -> karyogamy -> diploid teliospore -> germination, meiosis -> 4-celled promycelium -> haploid sporidia --- budding -> haploid yeast phase. Self-sporulating yeast strains also exist; they produce teliospore-bearing dikaryotic mycelium without conjugation. Banno placed Rhodosporidiuz in the Ustilaginaceae, a family of smut fungi (Heterobasidiomycetidae), due to the similarity of the life cycle of Rhodosp. toruloides and the general life cycle of the members of the Ustilaginaceae.
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