Family: Colonies of a fixed number of cells or reticulated bag in shape; chloroplasts plate-like or reticulated, with one or many pyrenoids; asexual reproduction by zoospores, sexual reproduction by fertilization (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: (Illustrations of The Japanese Fresh-water Algae, 1977).
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S. spinulosum 8 x 14 μm Ikenokochi marsh Tsuruga Fukui, 2004 |
S. spinulosum μm Aizu Recreation p. Aizuwakamatsu Fukushima, 2008  |
S. americanum 14 x 12 μm Aquatic botanical g. Sawara Chiba, 2004 |
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