Bluegreen Algae Description
Blue-green algae (cyanobacteria): Notorious for forming blooms (some of which are toxic), these organisms are not really algae, but rather aquatic bacteria that obtain their energy through photosynthesis. Like other bacteria, the cells are prokaryotic and therefore lack nuclei, chloroplasts, mitochondria, and flagella. Cyanobacteria may be single-celled or colonial, with colonies forming filaments, sheets, or even hollow balls.