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Strains of Rhodotorula fujisanensis (Basidiomycota, Urediniomycetes, Microbotryomycetidae), including the type strain, are sexually compatible and produce clamped mycelium with teliospores. However, as teliospore germination had not been documented, the complete sexual cycle was not known. During the course of this work, the basidial stage of R. fujisanensis was characterized. In addition, mating studies employing isolates that were identified preliminarily as Rhodotorula nothofagi, a species that is related closely to R. fujisanensis, yielded mycelium with teliospores, which formed basidia and basidiospores. The new data were evaluated by using several criteria, including the available molecular phylogenetic framework for the Microbotryomycetidae. Curvibasidium gen. nov. is described here, to accommodate two teleomorphs: Curvibasidium cygneicollum sp. nov. (CBS 4551T), which is described as the sexual stage of R. fujisanensis, and Curvibasidium pallidicorallinum sp. nov. (CBS 9091T), which is related closely to R. nothofagi, but does not represent its sexual stage.
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