A phylum of oxygenic photosynthetic bacteria comprised of unicellular to multicellular bacteria possessing CHLOROPHYLL a and carrying out oxygenic PHOTOSYNTHESIS. Cyanobacteria are the only known organisms capable of fixing both CARBON DIOXIDE (in the presence of light) and NITROGEN. Cell morphology can include nitrogen-fixing heterocysts and/or resting cells called akinetes. Formerly called blue-green algae, cyanobacteria were traditionally treated as ALGAE.

Synonyms: Blue Green Bacteria, Algae, Blue Green, Bacteria, Blue-Green, Algae, Blue-Green, Cyanophyceae, Cyanobacteria, Bacteria, Blue Green, Blue Green Algae, Blue-Green Bacteria, Blue-Green Algae, txid1117