Species [var. interruptm]: Cell body large, cylindrical, both ends conical;
4 chloroplasts present, trasverse section star-shaped, with smooth margins (lack incisions);
168-300 μm long, 34.5-63 μm wide.
[var. minor ]: Smaller than var. interrruptum,
82-154 μm long, 15-34 μm wide.
(Illustrations of The Japanese Fresh-water Algae, 1977).
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