Gamophyceae:
Zygnematales: Desmidiaceae
Cosmarium clevei
(Lundell) Lütkemüller
= Actinotaenium clevei (Lundell) Teiling ?
Genus: Unicellular; variable in shape; a constriction at the center of the cell body;
mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal,
rectangular, pyramidal or kidney-shaped; no apical indentation.
Subgenus [ Dysphinctium ]:
Cell body cylindrical or dumbbell-shaped, dorso-ventrally not compressed, transverse section circular .
Section [ Actinotaenium ]:
Cell body cylindrical, slightly constricted at the center, cell surface smooth or dotted or punctated
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species:
Semicells semi-spindle shaped, 67-117 μm long, 25-45 μ wide, L/W=2.5-3.5;
cell wall dotted (Illustrations of The Japanese Fresh-water Algae, 1977).
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Cosmarium clevei (Lundell) Lütkemüller, large variety
(or C. turgidum var. ovatum Nordstedt ?),
cell body 200 μm long, 77 μm wide, L/W=2.6, isthmus 75 μm wide,
cell size similar to that of Cosmarium turgidum but constriction not so strong as that of C. turgidum,
x 400, x 640, Kozuki Pond, Kinashi, Takamatsu city, Kagawa Pref., Japan, November 2002 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Cosmarium clevei (Lundell) Lütkemüller:
Semicells semi-spindle shaped, 67-117 μm long, 28-45 μ wide, L/W=2.5-3.5;
cell wall dotted (Illustrations of The Japanese Fresh-water Algae, 1977).
Cosmarium turgidum Brébisson var. turgidum:
Semicells ovoid, (165-215)-117 μm long, (75-86)-100 μ wide, L/W=2.0-2.3,
isthmus (58-77)-84 μm wide; slightly constricted at the center; cell wall puctated
(Illustrations of The Japanese Fresh-water Algae, 1977).
Cosmarium turgidum var. ovatum Nordstedt:
Semicells elongated ovoid or ellipsoidal, 154-200 μm long, 67-77 μm;
isthmus 42-45 μm wide; constriction slightly stronger than that of var. turgidum
(Illustrations of The Japanese Fresh-water Algae, 1977).
Please click on images for viewing enlarged.
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