HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Zygotes of Spirogyra alga, light micrograph. This filamentous green algae is named for the spiral arrangement of its chloroplasts. Its cylindrical cells, separated by walls, connect end-to-end in long green filaments. Here, sexual reproduction is taking place. In algae, this involves the fusion of reproductive cells (gametes) to form a zygote (black). Magnification: x280 when printed at 10 centimetres across.
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