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Systematics of the anamorphic basidiomycetous yeast genus Trichosporon Behrend with the description of five novel species: Trichosporon vadense, T. smithiae, T. dehoogii, T. scarabaeorum and T. gamsii

¹ Laboratorium voor Microbiologie, Wageningen University, Hesselink van Suchtelenweg 4, 6703 CT Wageningen, the Netherlands
² Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, 4600 Rickenbacker Causeway, Key Biscayne, Florida 33149, USA

Correspondence
Wouter J. Middelhoven
Wout.Middelhoven{at}wur.nl

Phylogenetic trees of the anamorphic basidiomycetous yeast genus Trichosporon Behrend, based on molecular sequence analysis of the internal transcribed spacer region and the D1/D2 region of the large subunit of ribosomal (26S) DNA, are presented. This study includes three novel species from soils, Trichosporon vadense sp. nov. (type strain, CBS 8901^T), Trichosporon smithiae sp. nov. (type strain, CBS 8370^T) and Trichosporon gamsii sp. nov. (type strain, CBS 8245^T), one novel species from an insect, Trichosporon scarabaeorum sp. nov. (type strain, CBS 5601^T) and one species of unknown origin, Trichosporon dehoogii sp. nov. (type strain, CBS 8686^T). The phylogenetic positions and physiological characteristics that distinguish the new taxa from related species, based partly on growth tests that are not traditionally used in yeast taxonomy (uric acid, ethylamine, L-4-hydroxyproline, tyramine and L-phenylalanine as sources of carbon and nitrogen, and polygalacturonate, quinate, 4-ethylphenol, phloroglucinol, 2,3-dihydroxybenzoate and orcinol as sole carbon sources), are discussed. Assimilation of L-rhamnose and erythritol and maximum growth temperature were also used to delineate species.

Published online ahead of print on 21 November 2003 as DOI 10.1099/ijs.0.02859-0.

The GenBank/EMBL/DDBJ accession numbers for the ITS region sequences of strains CBS 8901^T, CBS 8370^T, CBS 8686^T, CBS 5601^T and CBS 8245^T are AY093425, AF444397, AF444476, AF444446 and AF444424, respectively. The accession numbers for their D1/D2 region sequences are AY093426, AF444706, AF444718, AF444710 and AF444708, respectively.

A phylogenetic tree based on sequencing of the D1/D2 region and a dichotomous identification key to 36 Trichosporon species are available as supplementary material in IJSEM Online.

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