Family: Filamentous algae attached to a substrate at base, differentiation of axis-branch structure variable; cell body cylindrical, spherical or elongated ellipsoidal, with one or several plate-like chloroplasts; pyrenoids one to several in number or absent; terminal cells tapered or rounded at its end (Illustrations of The Japanese Fresh-water Algae, 1977).
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).

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Apical cells not hairly; axial filament 8-12 μm in diam.
S. tenue μm Inari Park Toyama, 2002	S. tenue ? 10-20 x 5 μm Kayoicho-ike Fukuoka, 2001	S. tenue ? 10-22 x 5 μm Nishi-Urawa Saitama, 2001	S. tenue ? stock Ti-3 & Ti-5 Inari Park Toyama, 2002
S. tenue ? μm Omiya Saitama, 2001	S. tenue ? μm Tone river Tsukiyono Gunma, 2003	S. tenue & st. Taw-12 11-15 x 6-10 μm Watarase river Ashikaga Tochigi, 2004	S. tenue 15 x 9 μm Furu-tone river Kasukabe Saitama, 2004
S. tenue 7-27 x 6-10 μm Tama river Chofu Tokyo, 2004	S. tenue 10-30 x 6-10 μm Karasu river Takasakis Gunma, 2004	S. tenue 8-23 x 6-13 μm Kurome river Asaka Saitama, 2004	S. tenue μm Showa-machi g.p. Showa Saitama, 2006
S. tenue μm Jinbei-numa Motono Chiba, 2006	S. tenue 10-25 x 6-7 μm drainage ditch Kawagoe Saitama, 2007
Apical cells hairly; axial filament 5-8 μm in diam.; no constriction at cell-cell junction
S. aestivale μm Itakura Central Park Itakura Gunma, 2003	S. aestivale ? 17-24 x 9.5 μm Tsukuba Ibaraki, 2000	S. aestivale ? μm Shiroyama Park Okegawa Saitama, 2006
Apical cells hairly; axial filament 10-15 μm in diam.; slight constriction at cell-cell junction
S. subsecundum 13-25 x 4-9 μm Watarase river Ashikaga Tochigi, 2004	S. subsecundum ? μm Ootagaya numa Tsurugashima Saitama, 2003	S. subsecundum ? μm Mikazuki-bashi Ushiku Ibaraki, 2002	S. subsecundum ? μm Onnenai Kushiro marsh Hokkaido, 2005
S. subsecundum 20-35 x 4-10 μm Ohnuma Nasu-shiobara Tochigi, 2006	S. subsecundum ? μm Binnuma-gawa Fujimi Saitama, 2006
???
S. lubricum ? μm Tsuki river Ranzan Saitama, 2003	Stigeoclonium sp. ? μm Akebono-yama A.P. Kashiwa Chiba, 2002	Stigeoclonium sp. ? μm water treatment c. Sakado Saitama, 2004	Stigeoclonium sp. ? μm Ikenokochi marsh Tsuruga Fukui, 2004

Similar Genus -> Chaetophora; Cloniophora;

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