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Blue-green algae

From Openwaterpedia

noun - Blue-green algae or Cyanobacteria, also known as Blue-green bacteria is a phylum of bacteria that obtain their energy through photosynthesis. The name "cyanobacteria" comes from the color of the bacteria (Greek: κυανός (kyanós) = blue).

Synonym: Blue-green bacteria, Cyanobacteria