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Diagnostic features

Densely united, heteropolar cyanobacterial filaments, forming mounds attached to surfaces. Filaments have heterocytes at their bases against the substrate and taper to long hair-like cells at the tips. Akinetes are lacking (cf. Gloeotrichia). False branching absent; filaments divide by development of an intercalary heterocyte, which dissociates from the parent filament and remains parallel to it within the colony. Organelles are absent from the cells.

Typical habitats

Streams, rivers or lakes.


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