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Diagnostic features

Colonies of hemispherical cells in pairs within mucilage.  Cells are usually bright blue-green and never contain organelles (chloroplasts, nuclei).  Mucilage surrounding the cells may contain faint layering.

Typical habitats

Lakes more than rivers


Kingdom Bacteria
Phylum Cyanobacteria
Class Cyanophyceae
Order Chroococcales
Family Chroococcaceae
Common name Cyanobacteria