Family: Cell body cylindrical or spindle-shaped, loosely attached with each other to form a filamentous colony; cell wall smooth, consists of a single partition, one layer; 1-2 chloroplasts plate- or ribbon-like, with pyrenoids; a single nucleus centrally placed.
Genus: Cell body elongate cylindrical; (Illustrations of The Japanese Fresh-water Algae, 1977) .
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R. obtsusa
v. anglica
51,74 x 8 μm
near Akai wetland
Aizuwakamatsu
Fukushima, 2005
R. obtsusa
v. anglica
μm
near Akai wetland
Aizuwakamatsu
Fukushima, 2008
Similar genus -->> Mesotaenium; Gonatozygon;
