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Description: Blue green algae ScytoemataceaeScytomataceae
appearance: cylindrical, untapered, unbranched filaments of auniseriate cells, but with false branching of the firmly sheathed filaments. It has heterocysts
Growth: apical never in place of heteroctysts. Cells divide and break sheath and grow longer.
reproduction may be by simple fragmentation of the tirchomes or filaments, or by hormogonia production.