FRANK FOX / SCIENCE PHOTO LIBRARY FRANK FOX / SCIENCE PHOTO LIBRARY
Euastrum desmid. Darkfield illuminated light micrograph of a Euastrum oblongum desmid green alga. Desmids are a common group of freshwater single-celled algae that have intricate cell walls. Magnification: x140, when printed 10 centimetres wide.
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