Abstract
Two new species in the anamorphic basidiomycetous genus Trichosporon (Tremellomycetes, Agaricomycotina) were uncovered in a DNA sequence-based molecular analysis of oleaginous yeasts maintained in the ATCC Mycology Collection. One yeast is named as Trichosporon cacaoliposimilis sp. nov. for its capability of synthesizing and accumulating a large amount of lipids having a composition equivalent to that of natural cacao butter. The type strain is ATCC 20505T, originally deposited as Trichosporon sp. The other can use food industry wastes and agricultural byproducts as the substrate for growth and accumulation of a high level of oil and accordingly is named Trichosporon oleaginosus sp. nov. The type strain is ATCC 20509T, previously identified as Cryptococcus curvatus. Molecular phylogenetic analyses indicate that T. cacaoliposimilis is a novel taxon in the Gracile clade of the genus, close to T. gracile and T. dulcitum, and that T. oleaginosus belongs to the Cutaneum clade, with T. jirovecii as the closest sister taxon. Other oleaginous yeasts were identified as new strains of known taxa, T. insectorum, Candida orthopsilosis and C. palmioleophila.
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