Species: Cell body medium in size, body length about 4/3 longer than its width, (67-76)-90-105 μm long, (50-62)-75-90 μm wide, isthmus (49-56)-79 μm wide; semicell half-circle in shape, apex slightly fattened; cell body covered with minute granules but smooth at the constriction zone; apical view of the cell body broad ellipsoidal (Illustrations of the Japanese fresh-water algae, 1977). I/W (isthmus/width) =0.88

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C. alpestre 72 x 56 μm Kodanuki marsh Fujinomiya Shizuoka, 2005	C. alpestre 70 x μm Numappara marsh Kuroiso Tochigi, 2003	C. alpestre 72,77 x μm Numappara marsh Kuroiso Tochigi, 2007	C. alpestre 70 x 52 μm O-ike park Yabuki Fukushima, 2003
C. alpestre stock Sku-1 51-54 x 45 μm I/W=0.96 Kurihashi Saitama, 2001	C. alpestre stock ??? 66 x 48 μm I/W=0.93 Numappara marsh Kuroiso Tochigi, 2004	C. alpestre μm Kashibaru m.II Karatsu Saga, 2008
C. alpestre or C. connatum ? 53 x 39 μm I/W=0.95 Uruguay, 1999	C. alpestre ? 34 x 29 μm Uruguay, 1999

Similar species -- >> C. connatum (62-100 x 45-74, isthmus 37-53 μ, I/W=0.72);

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