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Int J Syst Evol Microbiol. 2012 Jul;62(Pt 7):1715-20. doi: 10.1099/ijs.0.032748-0. Epub 2011 Oct 21.

Cryptococcus thermophilus sp. nov., isolated from cassava sourdough.

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Institute of Food Science and Biotechnology, University of Hohenheim, 70599 Stuttgart, Germany.


A novel anamorphic yeast, strain LTH 6662(T), was isolated from cassava sourdough. The isolate supposedly originated from cassava flour or was a contaminant thereof. Sequencing of the D1/D2 domain of the 26S rRNA gene indicated that strain LTH 6662(T) represents a novel species. Its closest relatives were members of the Cryptococcus humicola complex. The novel strain had several physiological characteristics that differed from those of related species: the ability to assimilate raffinose and cadaverine; the inability to assimilate soluble starch, xylitol, galactitol, butane-2,3-diol, sodium nitrite and lysine; the ability to grow without vitamins and at 42 °C; and the inability to produce starch-like substances. Its major ubiquinone was Q-10. In addition, buds were formed on small neck-like structures. In liquid medium, green or blue fluorescent substances were produced. The name Cryptococcus thermophilus sp. nov. is proposed, with LTH 6662(T) (=DSM 19443(T)=CBS 10687(T)) as the type strain.

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