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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium abbreviatum
Raciborski

Species [ var. abbreviatum ]: Cell body (11-15)-22 μm long, (11-14.5)-22 μm wide, L/W=1.0, isthmus (4.2-5.6)-7 μm wide; semicells broad hexagon in shape.
[ f. minor ]: 8-8.4 μ;m long, 8.5-9 μm wide.
[ var. planctonicum ]: (14)-19-29 μm long, (14)-22-30 μm wide; each corner rounded, apical margin convex.
[ f. pygmaea ]: Cell body smaller, upper side of lateral margins longer than lower side and concave, 11-14 μm long, 12-14 μm wide, isthmus 4.2-6 μm wide.
[ var. gremanicum ]: Apical and lateral margins slightly concave, 12.6 μm long, 11.2 μm wide, isthmus 3.4 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).
Cosmarium
C. abbreviatum
v. abbreviatum ?
19 x 18 μm
single pyrenoid
Kaga
Ishikawa, 2000
Cosmarium
C. abbreviatum
v. abbreviatum ?
12-14 x 12-13 μm
near Suga-daira m.
Ueda
Nagano, 2006
Cosmarium
C. abbreviatum
var. ?
13 x 10 μm
Shimo-no-koike
Shiga highland
Nagano, 2004
Cosmarium abbreviatum
C. abbreviatum
v. germanicum
12.5 x 11 μm
Hasu-ike
Shiga highland
Nagano, 2005
Cosmarium abbreviatum
C. abbreviatum
v. germanicum
16 x 14 μm
rice field
Ichinoseki
Iwate, 2005
Cosmarium abbreviatum
C. abbreviatum
v. germanicum
μm
Saiko 2
Toda
Saitama, 2007
Cosmarium abbreviatum
C. abbreviatum
f. pygmaea
μm
Ohyachi 2
Hachimantai
Akita, 2007
Cosmarium abbreviatum
C. abbreviatum
f. pygmaea
μm
Ochiai-numa 2
Noshiro
Akita, 2007
Cosmarium
C. abbreviatum ?
14 x 11 μm
rice field
Ichinoseki
Iwate, 2005

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Cosmarium abbreviatum
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