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Diagnostic features

Multiple filaments within a common sheath, forming "branching" tufts. Filaments are falsely branched, initiated at heterocytes.  Heterocytes usually ellipsoidal rather than spherical, and may be absent.  Filaments do not taper. Terminal cells hemispherical to almost spherical.  Blue or blue-green in colour.

Typical habitats

Most of our records are from good quality streams.


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