Light micrograph of Glaucocystis nostochinearum (Gr. glaucos, bluish-green & Gr. kystis, bladder ), a freshwater colonial Glaucophyte, showing parental cell walls with 4 ovoid daughter cells inside, each daughter cell containing several deeply lobed blue-green plastids. Culture material of the Culture Collection of Algae at the University of Cologne. Microscopic contrast method: Differential interference contrast. Magnification 580x when printed at 10 centimetres width.