DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Pumpkin stem. Light micrograph of a section through the stem of a pumpkin (Cucurbita pepo) plant. The tissues shown are (left to right): a single layer of epidermis with cuticle; under this is the cortex - the cells (blue) are round and full of chloroplasts (Chlorenchyma); long fibre cells (pink) with thick cellulose walls; parenchyma cells (blue). Magnification: x37 when printed 10 centimetres wide.
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