STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Cowslip pollen grain. Coloured scanning electron micrograph (SEM) of pollen grain from a common cowslip (Primula veris) flower. Pollen grains are the male sex cells of a flowering plant. Their characteristic surface is used by botanists to recognise and classify plants. Magnification: x3300 when printed at 10 centimetres wide.
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