Differential interference contrast (DIC) light micrograph of a green alga Pediastrum duplex. Pediastrum is a very distinctive coenobial colony with a flattened, often starlike shape. The outer half of the marginal cells extend into two horn-like processes with a tuft of long bristles (as seen in the photograph). Magnification: x475 when printed at 10 centimetres wide at its longest edge.