MAREK MIS / SCIENCE PHOTO LIBRARY MAREK MIS / SCIENCE PHOTO LIBRARY
Lily of the valley (Convallaria majalis) stomata. Brightfield illuminated light micrograph of a transverse section through stomata (oval) in the leaf of a lily of the valley plant. Stomata are pores that are the site of gaseous exchange in the plant. The opening and closing of the stomata is controlled by semicircular guard cells (sausage-shaped). When the guard cells are turgid the stomata are open and when they are flaccid the stomata are closed. Magnification: x400 when printed 10 centimetres wide.
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