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Studies of the mating systems of basidiomycetous yeasts from oceanic regions demonstrate that Rhodosporidium bisporidiis sp. n. and Rhodosporidium dacryoidum sp. n. have tetrapolar mating factors. Rhodosporidium infirmo-miniatum sp. n. is bipolar with three known alleles. The formal description of these three species is presented, as well as that of Rhodosporidium capitatum sp. n., a self-sporulating form. Rhodosporidium capitatum and Rhodosporidium bisporidiis are distinguished by the formation of basidia with terminal sporidia that develop on primary sporidia. The sporidia are not forcefully ejected. Rhodosporidium infirmo-miniatum has short basidia with terminal sporidia, but lacks primary sporidia. Rhodosporidium dacryoidum has two- to four-celled basidia with lateral sporidia. Rhodosporidium capitatum, Rhodosporidium infirmo-miniatum, and Rhodosporidium bisporidiis produce endospores. The taxonomic status of these species, and of the basidiomycetous yeast-like genera, is discussed.

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