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Chlorophyceae: Chlorococcales: Scenedesmaceae (or Dictyosphaeriaceae ?)

Pectodictyon
Taft 1945

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

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Pectodictyon
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