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Gamophyceae: Zygnematales: Desmidiaceae

Staurastrum hirsutum
Ehrenberg ex Brébisson in Ralfs 1848

Genus: Cell body short, radiate in shape; apical view of the cell, triangular, polygonal, ellipsoidal or spindle-shaped; zygospores formed outside of mother cells (Illustrations of The Japanese Fresh-water Algae, 1977)
Subgenus: lacks arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)

Species: Cell body 31-47 μm long (excluding spines), 31-47 μm wide, L/W=1.25, isthmus 11-15 μm (Illustrations of The Japanese Fresh-water Algae, 1977)
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Staurastrum hirsutum
S. hirsutum
45 x 40 μm
Hikage marsh
Shiga highland
Nagano, 2005
Staurastrum
S. hirsutum
?? x 40 μm
Mida-ga-hara
Gassan (mt.)
Yamagata, 2006
Staurastrum
S. hirsutum Numa-no-hara m.
Madarao highland
Niigata, 2006
Staurastrum
S. hirsutum
23 x 21 μm
Tanohara marsh
Shiga highland
Nagano, 2005
Staurastrum
S. hirsutum or
S. monticulosum ?
33 x 30 μm
Tanohara marsh
Shiga highland
Nagano, 2005
Staurastrum
S. hirsutum or
S. monticulosum ?
34 x 33 μm
Tanohara marsh
Shiga highland
Nagano, 2004
Staurastrum
S. hirsutum or
S. monticulosum ?
μm
Kuroyachi marsh
Hachimantai
Iwate, 2007
Staurastrum hirsutum
S. hirsutum
μm
Sensho-ga-hara
Shizukuishi
Iwate, 2007
Staurastrum
S. hirsutum ?
26 x 24 μm
Ukishima marsh
Tsugaike highland
Nagano, 2005
Staurastrum
S. hirsutum ?
22 x 21 μm
Shibu-ike
Shiga highland
Nagano, 2005
Similar species --> > S. kouwetsii (=S. pilosum, longer than 50 μm);

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Staurastrum hirsutum
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