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Multiple filaments in a single sheath.

Diagnostic features

Multiple unbranched, untapered, blue-green filaments lacking heterocytes, set tightly in parallel (sometimes twisted) within a common mucilaginous sheath. 

Typical habitats

Slow-flowing waters of moderate to good quality


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