Species:
Cell body broad ellipsoidal, cylindrical, or inverted ovoid, both ends rounded,
20-32 μm long, 13-27 μm wide; cellwall thick;
covered by two layers of gelatinous sheaths; papilla broad, short, rounded at corners;
length of flagella nearly the same as that of cell body; chloroplast cup-shaped, filling whole cell;
stigma rounded, at equator or slightly anterior; nucleus centrally located; two apical contractile
vacuoles at the base of flagella.
[var. subporosa (Skuja) Ettl 1993]:
Cell body larger (26-28 x 25-32 μm); inner cellwall finely porous; sexual reproduction by heterogamy
(Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983).
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