Genus: Filamentous algae without branching, no rhizoids, covered with gelatinous sheath; cell body cylindrical or ellipsoidal, cells attached side by side or separated; a single chloroplast band-form, with a pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species: Filament covered with a thick gelatinous coat; 2 or 4 cells closely contacted; cell body elongated ellipsoid or ovoid, 4-6 μm long, 7-9 μm wide; chloroplasts parietal, with a single pyrenoid (Photomicrographs of the Freshwater Algae, vol.4, 1985).

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G. ellipsoidea 5-12 x 11 μm Karasugamori Nishinasuno Tochigi, 2001 Movies	G. ellipsoidea 5-12 x 11 μm Karasugamori Nishinasuno Tochigi, 2001 Movies
G. ellipsoidea stock Tnk-2 5-9 x 11 μm parietal chlo. Tochigi, 2001	G. ellipsoidea stock Tnk-2 5-9 x 11.5 μm division furrows Tochigi, 2001	G. ellipsoidea stock Tnk-2 9-10 μm Zoospores with 4 flagella Tochigi, 2001

Similar genera -->> Microspora; Klebsormidium;

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