SYNOPSIS. Some of the cytologic features of Euglena gracilis Klebs, Euglena gracilis var. bacillaris Gross (colorless), and Astasia longa Pringsheim were compared in an electron‐microscope study. E. gracilis was readily differentiated from the colorless forms by the presence of chloroplasts. The 2 colorless forms were structurally similar; however, it was possible to differentiate bleached Euglena from Astasia longa by the presence of irregular plate‐like aggregates of paramylum in the former; similar forms of paramylum were not seen in chloroplast‐containing E. gracilis or in A. longa.
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Rogers et al. (1972) studied this question.
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