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Chlorophyceae: Chaetophorales: Chaetophoraceae

Stigeoclonium tenue
(Agardh) Kützing

Genus: Filamentous algae, axis-branch differentiation incomplete; terminal cells tapered to form spiny projections; branches do not form in tuft (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Branching not so frequent; secondary branching rare; branching axial cells shorter compared to non-branching cells; axial cells up to 8-12-(15) μm in diam., L/W=2-4; constriction present at cell junction (Illustration of the Japanese fresh-water algae, 1977).

Stigeoclonium sp. ?, cell body 10-20 μm long, 5 μm wide, x 640, Kayoicho-ike (pond), Kasuya town, Fukuoka Pref., Japan, October 2001 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
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