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Abstract
SUMMARY: Of the 49 strains of Trichosporon yeasts studied, 40 were retained in the genus and assigned to 10 species. The others were transferred to the genera Candida and Endomycopsis. The DNA base composition was determined for a representative of each Trichosporon species. On the basis of guanine and cytosine content (% GC), the species were arranged into four groups: (a) about 55 % GC, Trichosporon aculeatum, T. aquatile, T. cutaneum, T. inkin and T. pullulans; (b) about 64 % GC, T. eriense, T. fermentans and T. infestans; (c) 59 % GC, T. capitatum and (d) 45 % GC, T. penicillatum.
For 25 strains of the genus, 81 characteristics were selected for inclusion in a numerical taxonomic analysis with the aid of a computer. The dendrogram of the similarity values arranged these strains into three major branches arising at the 66 % S level. Branch I includes Trichosporon aculeatum, T. cutaneum, T. infestans, T. inkin and T. pullulans. Branch II is limited to T. aquatile. Branch III includes T. capitatum, T. eriense, T. fermentans and T. penicillatum. Species arising from branch I at differing S levels are T. aculeatum at 68 % S, T. pullulans at 72 % S, T. inkin at 75 % S and T. infestans at 78 % S. The remaining strains in branch I belong to the T. cutaneum group.
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