ALGAE BLUE GREEN

  A group of largely microscopic, photosynthetic organisms with a bacterial structure (prokaryote), but containing chlorophyll a and a photosynthesis biochemistry unlike other bacteria but similar to that of other algae and higher plants. Alternative names are blue-green bacteria, cyanophytes, cyanobacteria, or, probably the most suitable, cyanoprokaryotes. Blue and red pigments, contained within them, give an often characteristic color.