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Chlorophyceae: Chlorococcales: Scenedesmaceae

Crucigenia rectangularis
(Braun) Gay var. rectangularis
= Crucigeniella rectangularis (Nägeli) Komarek

Crucigenia Genus: Arrangement of 4 daughter cells flat and rectangular in shape, forming composite coenobium; without gelatinous sheaths, no hairly projections (Illustrations of the Japanese Freshwater Algae, 1977).
Species: Cell body ovoid or elongated ovoid, 6-14 μm long, 4-9 μm wide; 1-4 chloroplasts disc-shaped, parietal, each with a single pyrenoid (Photomicrographs of the Fresh-water Algae, vol. 6, 1987).
Similar species -->> Crucigenia neglecta;


Crucigenia rectangularis (Braun) Gay var. rectangularis, cell body elongated ovoid, mature cell body 11 μm long, 6 μm wide, young cell body 7 μm long, 4 μm wide (cell are exhausted?), x 640, Tsukuba Capio (Near Tsukuba Center), Tsukuba city, Ibaraki Pref., Japan, July 2002 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Crucigenia neglecta Crucigenia neglecta Crucigenia neglecta Crucigenia neglecta Crucigenia neglecta

* Crucigenia rectangularis (Braun) Gay var. rectangularis: Cell body ovoid or elongated ovoid, 6-14 μm long, 4-9 μm wide; 1-4 chloroplasts disc-shaped, parietal, each with a single pyrenoid (Photomicrographs of the Fresh-water Algae, vol. 6, 1987).

Crucigenia neglecta Fott and Ettl: Nearly rectangular colonies of 4 cells, with a small opening at the center; frequently developed to mutiple colonies of 8, 16 or more cells; cell body nearly straight cylindrical or slightly curved outward, with rounded ends, 5-9 μm long, 3-5 μm wide; a single chloroplast parietal, plate-like in young cells, filling entire cell body when matured (Photomicrographs of the Freshwater Algae, vol. 15, 1995).


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