Abstract

SUMMARYThe minimal nutrient requirements of 61 strains of desmids belonging to 18 different genera were investigated within 16 axenic cultures and 45 contaminated cultures. Thirty‐nine strains were autotrophic: they included all 30 strains belonging to the genera Cosmarium, Staurastrum, and Micrasterias. Twenty‐two strains were auxotrophic; they included all 14 strains belonging to the genus Closterium. Of the 22 auxotrophic strains, 13 required only vitamin B12; the specific requirements of the other 9 strains were not determined.

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