Species [ var. simplicissimum ]: Cell body nearly straight cylinder in shape, both ends truncated, 740-(848) μm long, 32-(33-34) μm wide, L/W=22-24; semicells with 3-4 waves at their base; cell wall dotted; (Illustrations of The Japanese Fresh-water Algae, 1977).
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P. simplicissimum
628 x 25 μm
L/W=25.1
Kannon-numa
Shimogo
Fukushima, 2005
P. simplicissimum
660 x 29-35 μm
L/W=
Kashibaru m.5
Karatsu
Karatsu, 2006
