Abstract
According to the ultrastructural, biochemical and physiological characters, three Chlorella -like strains, isolated from extremely low p H environments in Italy, were assigned to the species Viridiella fridericiana . The characters used were: absence of sporopollenin in the cell wall and of a pyrenoid in the chloroplast; hydrogenase activity, formation of secondary carotenoids under nitrogen deficiency, liquefation of gelatin, hydrolysis of starch; ability to grow on nitrate or ammonium containing media, thiamine requirement, acid-tolerance, salt-tolerance, termophily. The features considered, if compared to those of the type strain, did not reveal significant differences among the strains of V. fridericiana .
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