Species:
Cell body longitudinally assymmetrical (one side more domed than another), 13-16 μm long, 6-10 μm wide,
papilla present, with a flattened apex;
chloroplast parietal, asymmetrically located at one side; a pyrenoid at central-lateral;
stigma rounded, located anterior to the pyrenoid (near equator); nucleus at posterior half of the cell body.
[var. gallica Bourrelly 1951]:
Cell body ovoid, 14-22 μm long, 7-16 μm wide;
both corners of papilla slightly extruded becoming dichotomous; stigma elliptical;
sexual reproduction anisogamy.
[var. minima Bourrelly 1961]:
Anterior more sharpened; papilla conical; "Ausmaße" ? small (8 x 4 μm).
[var. triangularis Ettl 1965]:
Cell body triangular in shape, 8-11 μm long, 6-10 μm wide;
pyrenoid large.
(Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983).
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