Microcystis viridis is a type of cyanobacteria characterized by spherical cells that gather into colonies. These colonies vary in size and shape, often forming irregular clusters or mats on the water’s surface. Each individual cell is relatively small, typically ranging from 3 to 8 micrometers in diameter, and is enveloped in a mucilaginous sheath that gives the colony a slimy texture. Commonly found in freshwater environments such as lakes, ponds, and slow-moving rivers, Microcystis viridis has the ability to proliferate rapidly under favorable conditions, leading to the formation of blooms. While essential to aquatic ecosystems, this species can produce toxins harmful to other organisms and may pose health risks to humans during bloom occurrences.