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Sexuality in the genus Rhodotorula Harrison was first reported by Banno (1) with the descrip- tion of Rhodosporidium toruloides Banno 1967. The genus has since been expanded to include eight species (2). During a review of the genus for a new edition (Kreger-van Rij, in prepara- tion) of The Yeasts, a Taxonomic Study (3), we exammed a previously undescribed species from intertidal waters of south Florida in mangrove (Rhizophora mangle L.) swamps and black rush (Juncus roemerianus Scheele) marshes. The imperfect stage of this yeast has the character- istics of Rhodotorula graminis di Menna 1958, which is differentiated from other members of the genus Rhodotorula by the ability to assimi- late nitrate (as KN03) as a sole source of nitro- gen and the inability to utilize melezitose as a sole source of carbon (4). These isolates of R. graminis from intertidal sources were found to have a basidiomycetous life cycle when they were mixed on corn meal agar. The life cycle is heterothallic; cells from opposite mating types conjugated with the development of mycelia with clamp connections and round teliospores. The teliospores germinated to produce septate metabasidia with lateral and terminal basidio- spores. We isolated the basidiospores by micro- manipulation, followed by culturing and mating studies, and found only the parental mating types. This indicates that sexuality consists of a bipolar incompatibility system (5).

Rhodosporidium paludigenum sp. nov., a Basidiomycetous Yeast from Intertidal Waters of South Florida