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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium diplosporum
(Lundell) Lütkemüller
= Actinotaenium diplosporum (Lundell) Teiling 1954

Species [ var. diplosporum ]: Cell body medium in size, cylindrical, slightly constricted at center, 52-66 μm long, 23-33 μm wide, L/W=2.0; semicells slightly-ellipsoidal cylindroid, apex broadly rounded; cell wall finely dotted, chloroplasts consisting of longitudinal axis and radially-arranged laminae.
[ var. major ]: Larger than var. diplosporum, (98)-102-115 μm long, 43-47 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).
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Cosmarium diplosporum
C. diplosporum
45 x 25 μm
L/W=1.8
Kinchakuda
Hidaka
Saitama, 2004
Cosmarium
C. diplosporum
43 x 24 μm
47 x 26 μm
L/W=1.8
Kurome river
Asaka
Saitama, 2004
Cosmarium diplosporum
C. diplosporum
46 x 27 μm
L/W=1.7
Omatazawa ?
Nishiwaga
Iwate, 2007
Cosmarium  diplosporum
C. diplosporum ?
or C. thwaitesii ?
31 x 19 μm
L/W=1.6
Omine-numa
Tsukiyono
Gunma, 2003
Cosmarium diplosporum
C. diplosporum ?
or C. thwaitesii ?
32 x 21 μm
L/W=1.5
Tanohara marsh
Shiga highland
Nagano, 2004
Cosmarium
C. diplosporum ?
33 x 16 μm
L/W=2.1
Koyoen-megamiyama
Nishi-no-miya
Hyogo, 2004
Similar species -- >> C. globosum (L/W=1.5);

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Cosmarium diplosporum
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