Order & Family: Filamentous algae; cell division occurs near septum and adds "apical cap" (folded structure near the septum) ; cell body cylindrical, laterally straight or wavy or swell at one end of the cell body ("capitellate") in some species; chloroplasts reticulated with many pyrenoids; asexual reproduction by zoospore; sexual reproduction by fertilization by egg and sperm; monoecious or dioecious.
Genus: linear filament without branching (Illustrations of The Japanese Fresh-water Algae, 1977).

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Cell body laterally swelled at one end
Oedogonium sp.1 5 samples x 30-31 μm 1998-2005	Oedogonium sp.1' x 28 μm Miyashiro town Saitama, 2003	Oedogonium sp.1'' 75 x 25 μm Chl. band-form ? Yamagata, 1999
Oedogonium sp.2 50-75 x 18 μm Japan, 1998	Oedogonium sp.2 50-75 x 18 μm Ajisai Park Kodaira Tokyo, 2006	Oedogonium sp. 15-28 x 15-20 μm Toyonodai park Otone Saitama, 2006	Oedogonium sp. μm Isa-numa Kawagoe Saitama, 2008
Oedogonium sp.3 5 samples x 14 μm 1998-2004	Oedogonium sp.5 50-75 x 11 μm Japan, 1998	Oedogonium ? oogonium x 10 μm Shinobazu-ike Tokyo, 2001	Oedogonium ? x 11-14 μm Toneri Park Tokyo, 2001
Oedogonium sp. μm Omine-numa Tsukiyono Gunma, 2003	Oedogonium sp. μm Numappara marsh Kuroiso Tochigi, 2003	Oedogonium sp. x 8-11 μm Kejo-numa Furukawa Miyagi, 2003	Oedogonium sp. 16-35 x 24 μm Watarase river Ashikaga Tochigi, 2004
Oedogonium sp. μm near Michi-no-Oasis Shobu Saitama, 2004	Oedogonium sp. 62-67 x 6 μm Tennoh Tessei-cho Okayama, 2004	Oedogonium sp. 136 x 18 μm Aquatic botanical g. Sawara Chiba, 2004	Oedogonium sp. 80-85 x 17-20 μm Hasu-ike Shiga highland Nagano, 2005
Oedogonium sp. 52-56 x 12-19 μm Kusatsu Onsen b.t. Kusatsu Gunma, 2005	Oedogonium sp. 60-92 x 15 μm Iroha-numa Zao mountain Yamagata, 2005	Oedogonium sp. 97 x 16.5-18 μm Iroha-numa Zao mountain Yamagata, 2006	Oedogonium sp. 35-40 x 10 μm kenko-fukushi p. Koshigaya Saitama, 2005
Oedogonium sp. μm kenko-fukushi p. Koshigaya Saitama, 2006	Oedogonium sp. 30 x 9 μm Nagaike park Hachioji Tokyo, 2005	Oedogonium sp. 30-35 x 4-7 μm Ichinose-enchi Norikura highland Nagano, 2005	Oedogonium sp. 46-72 x 7 μm Kannon-numa Shimogo Fukushima, 2005
Cell body laterally straight
Oedogonium sp.10 5 samples x 44-49 μm 1999-2003	Oedogonium sp.11 14 samples x 31-40 μm 1998-2006	Oedogonium sp.9 x 34 μm Ranzan town Saitama, 2003	Oedogonium sp.9 x 29 μm Mishima Shizuoka, 2001
Oedogonium sp. x 26 μm Umi-no-nakamichi Fukuoka, 2001	O. tyrolicum 50 x 25 μm Hazama marsh Ashikaga Tochigi, 2006	Oedogonium sp. 63 x 19 μm Uruguay, 1999	Oedogonium sp. μm Kurihashi Saitama, 2001
Oedogonium sp. 4 8 samples x 12-18 μm 1998-2004	Oedogonium sp.6 4 samples x 6-10 μm 1998-2005	Oedogonium, x 640 12-13 x 4 μm Japan, 1998	O. pithophorae oogonium x 10 μm Tega-numa Chiba, 2000
Oedogonium sp. oogonium μm near Michi-no-Oasis Shobu Saitama, 2004
Apical caps absent ?
Oedogonium ? or Microspora ? x 90 μm Kashiwa Chiba, 2002	Oedogonium ? or Microspora ? x 39 μm Omiya Saitama, 2001	Oedogonium ? or Microspora ? 180 x 24 μm Iruma river Kawagoe Saitama, 2004
Oedogonium ? x 12-13 μm Shijuhachi-ike Shiga highland Nagano, 2005	Oedogonium ? 36-43 x 6 μm Shimo-no-koike Shiga highland Nagano, 2004	Oedogonium ? 29-41 x 6-8 μm Shimo-no-koike Shiga highland Nagano, 2005
Budding
Oedogonium sp. x 37 μm Japan, 1998	Oedogonium sp. x 31 μm Japan, 1998
Laterally wavy
O. undulatum 55-70 x 12-14 μm Aka-ike Madarao highland Niigata, 2006	O. undulatum μm Yamakado m. Nishi-Azai Shiga, 2008

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