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Coelastrum and Spirogyra green algae, LM
Light micrograph of the green algae Coelastrum sp. and Spirogyra sp. Coelastrum (right) forms hollow, spherical or polyhedral colonies with mostly 8 to 32 cells. The colonies are immobile. The cells have a chloroplast and a pyrenoid. Spirogyra (left) forms filamentous colonies and has mural, spiral chloroplasts. Microscopic contrast method : Differential interference contrast. Magnification 700x at a print width of 10 cm., Photo by GERD GUENTHER/SCIENCE PHOTO LIBRARY
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