DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY. DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY.
Scanning electron micrograph (coloured green) of the upper leaf epidermis of Pisum sativum, the garden pea. The surface is covered with a fuzzy waxy substance which acts as a water repellent. The tiny gaping mouths are stomatal pores, which open & close to regulate the passage of gas between the leaf and the atmosphere. The jigsaw puzzle effect of interlocking pieces corresponds to the arrangement of the epidermal cells; each piece representing a single large cell. Mag: X 100 (35mm). Original is BW print B745/45M.
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