Microcystis natans is a cyanobacterial species characterized by spherical cells that aggregate to form colonies. These colonies vary in size and shape, often appearing as irregular clusters. Each cell is small, typically ranging from 3 to 8 micrometers in diameter, and is enveloped in a mucilaginous sheath that contributes to the colony’s cohesion and slimy texture. These cyanobacteria are commonly found in freshwater habitats such as lakes, ponds, and slow-moving rivers. They have the ability to proliferate rapidly in favorable conditions, forming blooms. Microcystis natans plays an important ecological role in aquatic environments, though it can produce toxins harmful to other organisms and potentially to humans under certain environmental conditions.