Chlorophyceae:
Chlorococcales: Scenedesmaceae
Scenedesmus acuminatus
f. tortuosus (skuja) Uherkovich
Family: Colonies of a fixed number of cells (4, 8, 16, 32, or more) arranged 2- or 3-dimensionally;
cells spherical, ellipsoidal, polygonal, etc. in shape; chloroplasts 1 or several, plate-like in shape,
with 1 pyrenoid; reproduction only by asexual autospores.
Genus: Colonies of 4 (or 2, 8, 16) cells attached side by side, arranged linearly or zigzag;
cell body elliptical or spindle or crescent in shape; terminal cells with spiny projections in many species;
cell wall usually smooth, but in some species granulated or dented or ridged
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species:
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Scenedesmus acuminatus f. tortuosus (skuja) Uherkovich,
cell body (right) 35 μm long, 4 μm wide, L/W=8.8,
x 640, Japan, 1998 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
S. acuminatus (Lagerheim) Chodat var. acuminatus:
Colonies of 4 or 8 cells; in the 4-cell type, cells attached at center;
in the 8-cell type, cells attached in a zigzag pattern; cell body long spindle in shape;
cells at both end curved; cell wall smooth;
12-30 μm long,
2.5-6 μm diam.
(Illustrations of The Japanese Fresh-water Algae, 1977).
S. acuminatus f. maximus Uherkovich:
Larger than var. acuminatus;
28-50 μm long,
7-9 μm diam.
(Illustrations of The Japanese Fresh-water Algae, 1977).
S. acuminatus f. tortuosus (skuja) Uherkovich:
Cells at both end strongly curved;
20-45 μm long,
3-7 μm diam.
(Illustrations of The Japanese Fresh-water Algae, 1977).
S. acuminatus var. elongatus G. M. Smith:
Only two cells attached at center; both cells curved outside;
40-50 μm long,
2-5 μm diam.
(Illustrations of The Japanese Fresh-water Algae, 1977).
Please click on images for viewing enlarged.
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