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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

Closterium parvulum
Nägeli var. angustum W. et G.S. West

Species: [ var. parvulum ]: Cell body curved, not swelled at the center (inner side straight or slightly concaved), tapered toward both thorn-like or slightly rounded ends (cf. C. calosporum), a small pore present on its outer side, 60-160 μm long, (8.5-15)-17 μm wide, L/W=7-10; cell wall smooth, transparent; chloroplasts with fewer laminae (only two visible); 3-5 pyrenoids in each chloroplast.
[ var. angustum ]: Elongate and thinner than var. parvulum, 75-(98-141) μm long, 5-(8.5-11) μm wide, L/W=11-15; curvature variable (Illustrations of The Japanese Fresh-water Algae, 1977).
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Closterium
C. parvulum
v. angustum
120 x 10.5 μm
L/W=11.4
Koga general park
Koga
Ibaraki, 2003
Closterium
C. parvulum
v. angustum
130 x 10 μm
L/W=13.0
Koigakubo marsh
Tessei-cho
Okayama, 2004
C. parvulum
cell μm
Higashi-hiroshima
Hiroshima, 1998
C. parvulum
cell μm
Higashi-hiroshima
Hiroshima, 1998
Closterium parvulum
C. parvulum
v. angustum
140 x 12 μm
L/W=11.7
Iyari marsh
Omachi
Nagano, 2006
Closterium parvulum
C. parvulum
v. angustum
156 x 13 μm
L/W=12.0
Oh-numa marsh
Kakunodate
Akita, 2007
Similar species -- >> C. calosporum; C. venus ( < 85 μm ); C. dianae ( > 150 μm );

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Closterium parvulum
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