(Nostoc sp) Cyanobacteria. LM X25., ALGAE,BLUE,CLOSE UP,COLONY,CYANOBACTERIA,DIRECTLY,FILAMENTOUS,GREEN,LIGHT,LM,MAGNIFICATION,MICROGRAPH,MICROSCOPIC,MICROSCOPY,NOSTOC,PROKARYOTE,SCIENCE,SCIENTIFIC,SHOT,STUDIO,WHITE,Plants, Visuals Unlimited