Species [Ralfs f. quadratum]: Cell body 48-(53-73) μm long, 25-(28-40) μm wide, isthmus 12-(20-26) μm wide, L/W=2; bay opening closed; semicells rectangular, rounded at base with frontal slight depression; apical corners broadly rounded; side view elliptical or oval; apical view elliptical; cellwall smooth.
[f. willei W. et G.S. West] Cell body 50-(55-82) μm long, (30-36.5)-40 μm wide, isthmus 17-27 μm wide, bay slightly opened; side margins of semicells nearly straight lacking slight depression at base (Illustrations of The Japanese Fresh-water Algae, 1977).
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C. quadratum f. willei 70 x 37 μm L/W= Senjo-ga-hara Nikko Tochigi, 2003 |
C. quadratum f. willei 75 x 37 μm L/W= Numa-no-hara marsh Madarao highland Niigata, 2005 |
C. quadratum ? f. willei 64 x 36 μm L/W= Numa-no-hara marsh Madarao highland Niigata, 2005 |
C. quadratum ? f. willei 50 x 30 μm L/W=1.7 Numa-no-hara m. Madarao highland Niigata, 2005 |
C. quadratum f. quadratum 80 x 39 μm L/W=2.1 Maimeno-ike Norikura highland Nagano, 2006  |
C. quadratum f. quadratum ? 67-73 x 37-40 μm L/W= near Karakemi marsh Omachi Nagano, 2005 |
C. quadratum f. willei ? 69 x 37 μm L/W=1.9 Iyari marsh Omachi Nagano, 2006 |
C. quadratum f. willei ? 60 x 33 μm L/W=1.8 near Lake Aoki Omachi Nagano, 2006 |
C. quadratum f. willei ? 62 x 33 μm L/W=1.9 Tane-ike Togakushi highland Nagano, 2006 |
C. quadratum f. willei ? μm L/W= Miyatoko m.1 Minami-Aizu Fukushima, 2008 |
