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Diagnostic features

Sheathed, tapering heteropolar blue-green filaments lacking heterocytes and akinetes. False branching rare. Sheath extends well beyond terminal cells, which are attenuated to colourless hair-like cells. Similar to Ammatoidea, but with heteropolarity.

Typical habitats

Streams of moderate to good water quality


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