Family: Colonies of a fixed number of cells (4, 8, 16, 32, or more) arranged 2- or 3-dimensionally; cells spherical, ellipsoidal, polygonal, etc. in shape; chloroplasts 1 or several, plate-like in shape, with 1 pyrenoid; asexual reproduction by autocoenobium (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Cells arranged three-dimentionally; cell body spherical or triangular pyramid in shape (Illustrations of The Japanese Fresh-water Algae, 1977).

Google Image Search

P. pyramidale colony μm cell 9 μm Lake Kawaguchi Yamanashi, 2001	P. pyramidale colony 27 μm cell μm near Ayu river Fujioka Gunma, 2004	Pectodictyon sp. or Coelastrum ? colony μm cell 9 μm Japan, 2000	Pectodictyon sp. colony 24 μm cell μm Kumakubo Nasu-shiobara Tochigi, 2005
Pectodictyon sp. or Coelastrum ? colony μm cell μm Koshigaya Saitama, 2001	Pectodictyon sp. colony μm Kashiwa Village m.p. Kashiwa Chiba, 2008

Similar genus --> Coelastrum

Please click on species name for more images.

Copyright Protist Information Server