Chlorophyceae:
Chlorococcales: Scenedesmaceae
Scenedesmus acuminatus
(Lagerheim) Chodat var. acuminatus
Syn.: S. dimorphus (Turpin) Kützing;
S. falcatus Chodat
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 [ var. acuminatus ]: Colonies of 4 or 8 cells; cells arranging linearly (4 cells) or zigzag
(8 cells); cell body elongated spindle-shaped, outer cells curved outward,
12-30 μm long, 2.5-6 μm wide; cell wall smooth
(Illustrations of The Japanese Fresh-water Algae, 1977).
|
Scenedesmus acuminatus 4-cells type (similar to S. acutus ?
but cells not spindle in shape),
mature (?) cell body 15 μm long, 3 μm wide, L/W=5.0,
x 400, Japan, 1998 by Y. Tsukii
50 μm
100 μm
150 μm; x 400
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.
Copyright
Protist Information Server