Species [ var. furcatospermum ]: Cell body 18-(19.6-29) μm long, 16.5-(18-25)
μm wide, isthmus 5.6-8.4 μm wide; semicells semicirucular with flattened apex,
margins wavy (laterally 4-5 waves, apically 4 waves); two rows of granules radially arranged within the margin;
central region smooth (lacks granules or other ornaments).[ var. koreanum Skvortzow ]: 31-32 μm long, 25-28 μm wide, isthmus 8-11 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977). |
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
