MAREK MIS / SCIENCE PHOTO LIBRARY MAREK MIS / SCIENCE PHOTO LIBRARY
Micrasterias desmids. Phase contrast light micrograph of Micrasterias americana desmid green algae. Desmids are a common group of freshwater single-celled algae that have intricate cell walls. Micrasterias is highly adapted to nutrient poor, acidic water. Magnification: x200, when printed 10 centimetres wide.
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