Species:
Cell body spherical in shape (sometimes broaden), 12-22(-27) μm in diam.; papilla absent;
chloroplast cup-shaped, with a large anterior concavity; a single spherical pyrenoid located at posterior half of the cell body;
stigma elongated in shape, longitudinally located at equatorial line or slightly anterior; nucleus at anterior.
[var. macropyrenoidosa Ettl 1965]:
Pyrenoid large, ellipsoidal in shape; stigma elliptical or narrowed spot
(Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983).
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