Green alga, light micrograph
Differential interference contrast (DIC) light micrograph of a desmid, Closterium sp. The desmids are a group of unicellular green algae characterised by their beautifully shaped cell walls. The cell is split into two halves, joined by a waist. Magnification: x150 when printed at 10 centimetres wide at its longest edge., by HAKAN KVARNSTROM / SCIENCE PHOTO LIBRARY
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