HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Spirogyra filamentous algae, polarized light micrograph. This filamentous green algae is named for the spiral arrangement of its chloroplasts (green). Its cylindrical cells, separated by walls (transverse lines), connect end-to-end in long green filaments. Magnification: x170 when printed at 10 centimetres across.
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