Family: Unicells; cell body spherical or broad ellipsoidal; chloroplasts 1 to several in number, cup-shaped or plate-like, reticulated or star-shaped; with or without pyrenoids; reproduction by autospores and zoospores; many species found in soil (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Subaerial algae; cell body without gelatinous coat; a single chloroplast cup-shaped with a pyrenoid (Illustrations of The Japanese Fresh-water Algae, 1977).

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Asexual reproduction by zoospore formation
C. infusionum 7 x 3 μm Asaka Saitama, 2000	C. infusionum stock Sak-1 8 x 3 μm Asaka Saitama, 2000	C. infusionum stock Sak-1 μm Asaka Saitama, 2000	C. infusionum stock Sak-1 μm Asaka Saitama, 2000
C. infusionum stock Sua-5 zoospore formation μm Akigase Park Saitama, 2002	C. infusionum zoospore formation 8 x 3 μm Mizumoto Park Tokyo, 2001	C. infusionum 6-34 μm Kumakubo Nasu-shiobara Tochigi, 2005
Chlorococcum sp. 5-20 μm Saitama, 2000	Chlorococcum sp. zoospores 8-8.5 x 4-5 μm Kuroiso Tochigi, 1998	Chlorococcum ? 10 x 6.5 μm Kosugi Toyama, 2002	Chlorococcum ? 7-16 x 5-12 μm Watarase Tochigi, 2001
Chlorococcum ? μm Omine-numa Tsukiyono Gunma, 2003	Chlorococcum ? μm Naruto Chiba, 2003	Chlorococcum ? μm Kejo-numa Furukawa Miyagi, 2003	Chlorococcum ? μm Tama river Tokyo, 2004
Chlorococcum ? μm Furu-tone river Kasukabe Saitama, 2004	Chlorococcum ? 5 x 2.5 μm Kumakubo Nasu-shiobara Tochigi, 2005
Asexual reproduction by autospore formation
Chlorococcum sp. 12-19 μm φ Kaga Ishikawa, 2000	Chlorococcum sp. stock Ikk-20 & -21 axenic culture 4, 17 μm Ishikawa, 2000	Chlorococcum sp. stock Ikk-10 axenic culture 9-14 μm φ Ishikawa, 2000	Chlorococcum ? or Gloeocystis ? 9-10 x 7-9 μm Ueno Tokyo, 2001
Chlorococcum ? or Oocystis ? 24 x 18 μm Kaga Ishikawa, 2000	C. vacuolatum or C. macrostigmatum μm Otto-Numa Tsuchiura Ibaraki, 2002	C. vacuolatum or C. macrostigmatum & stock Cka-1 Akebono-yama A.P. Kashiwa Chiba, 2002	Chlorococcum sp. -20 μm φ Shibu-ike Shiga highland Nagano, 2005

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