Spirulina/Arthrospira (Phormidiaceae)
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Diagnostic features
Unbranched blue-green cyanobacterial filaments with a helical twist. Crosswalls between cells are often hard to see. A fine mucilage sheath surrounds the filament, within which the filament may be motile. Heterocytes absent. Organelles absent from the cells, but granules may be common.