Species [ var. amoenum ]:
Cell body cylindroid, 42-67 μm long, (22-28)-30 μm wide,
L/W=2, isthmus 13-21 μm wide; cell wall covered with large granules,
longitudinally arranging in 7-8 rows forming a cross (+) pattern on the cell wall;
2 pyrenoids in each semicell.
[ var. alternans ]: Cell body 44-45 μm long, 23-24 μm wide,
isthmus 15.4 μm wide; granules arranging as an "X"-shaped pattern on the cell wall
(Illustrations of The Japanese Fresh-water Algae, 1977).
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