Differential interference contrast (DIC) light micrograph of Merismopedia sp. Merismopedia is a genus of cyanobacteria found in fresh and salt water. It is ovoid or spherical in shape and arranged in rows and flats, forming rectangular colonies held together by a mucilaginous matrix. Species in this genus divide in only two directions, creating a characteristic grid-like pattern. Magnification: x140 when printed at 10 centimetres wide at its longest edge.