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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum senarium
(Ehrenberg) Ralfs
Identified by Rupert Lenzenweger ( Zieralgen Desmidiaceen verborgene Schönheiten im Wasser, Austria)

Staurastrum senarium Species [var. senarium ]: Cell body 21-31 μm long (excluding spiny projections), 29-36 μm long (including spiny projections), 27-34 μm wide (including spiny projections), isthmus 8.4-12 μm wide.
[ var. simplex Hirano ]: Smaller than var. senarium, 23 μm (excluding spiny projections), 44 μm (including spiny projections), 43 μm wide (including spiny projections), isthmus 7 μm wide; projections at posterior side margins of semicells are simple spines (not dichotomous).
[ var. nigrae-silvae Schmidle ]: 2 ring of dented structures surrounding each corner, 29 μm (including spiny projections), 36.4 μm wide, isthmus 12.5 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977)

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Staurastrum senarium (Ehrenberg) Ralfs (identified by Rupert Lenzenweger), cell body 33 μm long, 24 μm wide, L/W = 1.4, isthmus 10.5 μm wide, x 400, x 640, Hiroshima University, Hiroshima Pref., Japan , September 1998 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 senarium Staurastrum senarium Staurastrum senarium Staurastrum senarium

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