Genus: Cell body long cylindroid; a slight constriction at center; cross section of the semicells spherical,
slightly swell at the center but without a folded structure as
Docidium; slightly tapered toward both ends, which are truncated and smooth or
surrounded by granules or various small structures; laterally straight or wavy, with spiny
projections in some species; 2-10 ribbon-like chloroplasts in each semicell;
with many pyrenoids; a vacuole containing active granules at both ends same as in
cell wall mostly dotted, but with spines or other patterns in some species
(Illustrations of The Japanese Fresh-water Algae, 1977).
Similar genus ->> Triploceras;
Pleurotaenium kayei (Archer) Rabenhorst, cell body μm long, μm wide, L/W=, x 640, No.1, Ko-numa (pond/marsh), Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, October 12, 2008 by Y. Tsukii
100 μm 200 μm 300 μm; x 200
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