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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum gracile
Ralfs var gracile

Staurastrum gracile Species [ var. gracile ]: Cell body 28-47 μm long, 39-77 μm wide (including arms), isthmus 8.4-11 μm;
[ var. coronulatum Boldt ]: Cell body 26-28 μm long, 34-41 μm wide (including arms), isthmus 6.5-10 μm;
[ var. ornatum Krieger ]: Cell body 38.7 μm long, 62.4 μm wide (including arms), isthmus 13 μm; a pair of warts present at each posterior margin of semicells (Illustrations of The Japanese Fresh-water Algae, 1977)

Staurastrum gracile, with two arms, cell body 18 μm long, 41 μm wide (including arms), x 400, x 640, Vermont-Maine USA, August 7-13, 1999, by Y Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum Staurastrum Staurastrum

Staurastrum gracile Ralfs var gracile: Cell body 28-47 μm long (including arms), 39-77 μm wide (including arms), isthmus 8.4-11 μm wide; in apical view, small 4 knob-like structures at each side (Illustrations of The Japanese Fresh-water Algae, 1977)

Staurastrum gracile var. coronulatum Boldt: Cell body 26-28 μm long (including arms), 34-41 μm wide (including arms), isthmus 6.5-10 μm wide; in apical view, 2 knob-like structures at each side, each knob with a slight depression (Illustrations of The Japanese Fresh-water Algae, 1977)

Staurastrum gracile var. ornatum Krieger: Cell body 38.7 μm long (including arms), 62.4 μm wide (including arms), isthmus 13 μm wide; in apical view, a couple of knob-like structures at each side (Illustrations of The Japanese Fresh-water Algae, 1977)

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