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Diagnostic features

Cyanobacterial unicells or small colonies attached to surfaces. Cells ovoid to irregularly shaped, blue-green, enveloped by a thin mucilaginous sheath. Organelles absent from the cells. 

Typical habitats

Attaches to filamentous algae


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