Five new yeast species, and , are described to accommodate isolates recovered from flowers and floricolous insects of Australian trees, cosmopolitan morning glories ( spp.) and Brazilian cereoid cacti. The new species are heterothallic, occur in the haploid condition and are clearly separated reproductively from one another. Although they exhibit little physiological variation, they are easily delineated from , the only species known previously, by their resistance to cycloheximide and the production of strong extracellular lipases. and share the latter property, but unlike the species, they fail to utilize nitrate as sole nitrogen source. PFGE indicates that these yeasts have an unusually low number of chromosomes. The large-subunit rDNA (D1/D2) sequences demonstrate a close relationship between the five species and and Their relationship with is more distant, but all share, with some other species, a single monophyletic clade. The type and isotype strains are as follows: strains UWO(PS)95–604.3(h; CBS 8456) and UWO(PS)95–631.3(h; CBS 8457); strains UFMG96–267(h; CBS 84540 and UFMG96–381(h; CBS 8455); strains UWO(PS)91–698.4(h; CBS 8452) and UFMG96–2121 (h; CBS 8453); UWO(PS)91–716.3(CBS 8459); and UWO(PS)91–681.3(CBS 8458).


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