Species [var. macilentum ]:
Cell body large, elongated, both side nearly straight at central region, slightly tapered and curved toward ends,
260-(432-678)-800 μm long, 11-(14-21)-25 μm wide,
L/W=25-40; cell wall smooth, transparent, bands present; 6-15 pyrenoids in each semicell.
[ var. japonicum ]: Cell body wider at the center and narrower at ends than var. macilentum,
400-(447-5780-600 μm long, 23-(32-34) μm wide,
L/W=12-18; cell wall finely striated (Illustrations of The Japanese Fresh-water Algae, 1977).
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