Four novel d-xylose assimilation yeast strains were isolated from rotting wood and a lichen sample collected in the Kyushu region of Japan. Species identifications were performed by analysing the internal transcribed spacer 5.8S region sequences and the D1/D2 variable domain of the large subunit rRNA gene. Phylogenetic analysis suggested that these isolates are closely related to species isolated in China, such as and . These isolates also showed sequence similarity to deposited sequences labelled as . They did not produce asci and ascospores under any of the test conditions. Based on phylogenetic analysis and phenotypic differences, f.a., sp. nov. is proposed to accommodate these isolates. The holotype of f.a., sp. nov. is NBRC 116146 (CBS18366). This species is able to ferment d-xylose, and a d-xylose fermentation test revealed that this species produces a considerable amount of xylitol.
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