Abstract
Isolates listed as Trebouxia in the various culture collections throughout the world were obtained and cultured on an inorganically enriched, agarized medium under standard conditions of light and temperature. The morphological attributes of the thirty-three isolates were observed. Previous literature concerned with the genus Trebouxia is reviewed. Eleven of the isolates are Trebouxia, six of which are new species. A new genus Pseudotrebouxia, comprising six species, is erected in the order Chlorosarcinales to include those isolates exhibiting demoschisis. Morphological keys to the species of Trebouxia and Pseudotrebouxia are provided.

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