GERD GUENTHER / SCIENCE PHOTO LIBRARY GERD GUENTHER / SCIENCE PHOTO LIBRARY
Nostoc cyanobacteria. Darkfield contrast micrograph of a mass of Nostoc sp. filamentous cyanobacteria (blue-green algae) found on the surface of soil. Nostoc algae have the ability to fix atmospheric nitrogen, thereby playing a major role in soil fertility. They have a wide distribution and are commonly found in soil and on mud, rocks and plants. Magnification: x230 when printed 10 centimetres wide.
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