DAVID MCCARTHY / SCIENCE PHOTO LIBRARY DAVID MCCARTHY / SCIENCE PHOTO LIBRARY
Mint leaf surface. Coloured scanning electron micrograph (SEM) of the surface of a mint (Menta sp.) leaf. The white structures are oil glands, modified glandular hairs that secrete oils that give this plant its aroma. The olive green structures are stomata, pores in the leaf surface that are the site of gaseous exchange in the plant. The opening and closing of the stomata is controlled by semi-circular guard cells. When the guard cells are turgid the stomata are open and when they are flaccid the stomata are closed.
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