MAREK MIS / SCIENCE PHOTO LIBRARY MAREK MIS / SCIENCE PHOTO LIBRARY
Cosmarium desmid. Polarised light micrograph of a Cosmarium sp. desmid (right) and filamentous algae (left). Desmids are a common group of freshwater single-celled algae that have intricate cell walls. Magnification: x400 when printed 10 centimetres wide.
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