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. Microscopic contrast method: differential interference contrast (DIC). Magnification: x580 when printed at 10 centimetres width.