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Chlorophyceae: Chlorococcales: Oocystaceae

 Kirchneriella acuminata
Hirose et Akiyama
or Kirchneriella aperta Teiling (G.E. Dillard, 1989)

Kirchneriella Family: Unicells or colonies of non-fixed number of cells; cell body variable in shape; one or more chloroplasts variable in shape; a sexual reproduction by autospore (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Colonies of 4, 8, 16 or 32 cells in a gelatinous sheath; cell body long cylindroid, strongly curved or twisted, both ends rounded; a chloroplast full within the cell; a single pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species: Colonies within a gelatinous matrix, cells crescent in shape, termini tapered, 25-30 μm long, 8-10 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar Genus -->> Selenastrum; Selenodictyum; Dimorphococcus;

Kirchneriella acuminata Hirose et Akiyama (or K. aperta Teiling (by G.E. Dillard, 1989) ?), colonies of cells within a gelatinous matrix, cells crescent in shape, termini pointed, μm long, μm wide x 400, x 640, Saitama Pref., Japan, May-June 1999 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Kirchneriella Kirchneriella

Kirchneriella lunaris (Kirchner) Moebius: Colonies of 4-32 cells within a gelatinous matrix, cells crescent in shape, termini rounded, 8-12 μm long, 3-6 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Kirchneriella obesa (W. West) Schmidle: Similar to K. lunaris but more spherical, 5-6 μm diam. (Illustrations of The Japanese Fresh-water Algae, 1977).

Kirchneriella acuminata Hirose et Akiyama: Colonies within a gelatinous matrix, cells crescent in shape, termini tapered, 25-30 μm long, 8-10 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

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