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Diagnostic features

Unbranched, untapered, blue-green filaments with cells shorter than wide (cf. Phormidium), lacking heterocytes. Filaments occur within a firm sheath, and may glide within them. Short sections of filament (hormogonia) can break out of the sheath. 

Typical habitats

Common in lowland streams/rivers


Kingdom Bacteria
Phylum Cyanobacteria
Class Cyanophyceae
Order Oscillatoriales
Family Oscillatoriaceae
Common name Cyanobacteria