Definition: 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.
Other names Cyanophyceae; Blue-Green Bacteria; Algae, Blue-Green; Blue-Green Algae; Blue Green Bacteria; Blue Green Algae; Bacteria, Blue-Green; Bacteria, Blue Green; Algae, Blue Green