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Int J Syst Evol Microbiol 59 (2009), 181-185; DOI  10.1099/ijs.0.004515-0
© 2009 International Union of Microbiological Societies

Cryptococcus tepidarius sp. nov., a thermotolerant yeast species isolated from a stream from a hot-spring area in Japan

Masako Takashima1, Takashi Sugita2, Yoshimi Toriumi2 and Takashi Nakase3

1 Japan Collection of Microorganisms, RIKEN BioResource Center, Wako, Saitama 351-0198, Japan
2 Department of Microbiology, Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan
3 NITE Biological Resource Center, Department of Biotechnology, National Institute of Technology and Evaluation, 2-5-8 Kazusakamatari, Kisarazu-shi, Chiba 292-0818, Japan

Correspondence
Masako Takashima
masako{at}jcm.riken.jp

Anamorphic basidiomycetous yeast strains M9962T and M9963 were isolated from water samples collected from a small stream in Ohwakudani, Hakone, a hot-spring area in Japan. These belonged to a single species and were phylogenetically closely related to Bullera lagerstroemiae, although the ability to form ballistoconidia was not observed. Based on sequence analyses of the D1/D2 domain of the LSU rDNA and ITS regions and differences in G+C content, the name Cryptococcus tepidarius sp. nov. Takashima, Sugita, Toriumi et Nakase (Trichosporonales, Tremellomycetes, Basiomycota) is proposed for these isolates, with strain M9962T (=SP-5T =JCM 11965T =CBS 9427T) as the type strain. The strains grew in YM broth at 47 °C and in YM broth with the pH adjusted to 1.5 by HCl, indicating that the species is thermotolerant and acid-tolerant.

Abbreviations: ITS, internal transcribed spacer

The GenBank/EMBL/DDBJ accession numbers for the ITS region and LSU rDNA D1/D2 domain sequences of strain M9962T are AB094045 and AB094046, respectively.

Results of growth of strain M9962T at different temperatures and pH are available as supplementary material with the online version of this paper.






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