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Diagnostic features

Radiating colonies of heteropolar tapering filaments, each with a heterocyte and akinetes at the base and hair-like terminal cells at the opposite end.  Each filament has a sheath, and the whole colony is enveloped in mucilage. Colonies form approx. spherical, green or yellow masses attached to surfaces.

Typical habitats

Attaches to plant surfaces in slow/still waters.


Kingdom Bacteria
Phylum Cyanobacteria
Class Cyanophyceae
Order Nostocales
Family Rivulariaceae
Common name Cyanobacteria