Order: Uninucleate filamentous algae without branching; cell body mostly cylindrical; all cells can divide; chloroplasts parietal with one or more pyrenoids; asexual reproduction by fragmentation of algae or formation of zoospores with two or four flagella; usually eyespot present; sexual reproduction by isogamy, anisogamy or oogamy
Family: Chloroplasts plate-like or ribbon-like; sexual reproduction by isogamy.
Genus: Filamentous algae without branching, no rhizoids, covered with gelatinous sheath; cell body cylindrical or ellipsoidal, cells attached side by side or separated; a single chloroplast band-form, with a pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).

Google Image Search

G. mutabilis 11 samples x 7-20 μm 1999-2008	G. mutabilis ? 11 samples x 7-20 μm 1999-2008	G. ellipsoidea 28 samples x 5-12 μm 2001-2008	G. ellipsoidea 27 samples x 5-12 μm 2001-2008
Geminella sp. G. ellipsoidea ? x 13 μm Shimo-kawahara p. Sayama Saitama, 2005	Geminella ? 6-11 x 8 μm Iroha-numa Zao mountain Yamagata, 2005	G. pulchra 11 samples x 4.5-9 μm 2001-2007	G. pulchra 11 samples x 4.5-9 μm 2001-2007
Geminella sp. x 5 μm Higashi-sano Hakuba Nagano, 2004	G. interrupta ? 10-12 x 6 μm Satsunai river Obihiro Hokkaido, 2005	G. interrupta ? x 10 μm Nishi-Urawa Saitama, 2001	G. interrupta ? x μm Iyari marsh 1 Omachi Nagano, 2007
G. minor 3 samples x -8 μm 2000-2003	stock Fkom-1 μm Komado marsh Showa & Tajima Fukushima, 2004	Geminella ? 7-11 x 7 μm Iruma river Kawagoe Saitama, 2004	Geminella or Klebsormidium or ? 7-11 x 7 μm Hachiman-numa Hachimantai Iwate, 2005

Similar genera -->> Ulothrix; Microspora; Klebsormidium;

Please click on species name for more images.

Copyright Protist Information Server