POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Scanning electron micrograph (sem) of an open stoma on a Beech Leaf, purple or copper Beech (Fagus sylvatica) Purpurea group. Stomata are pores that open and close in order to regulate gas exchange in a plant. A stoma comprises a pore, the aperture of which is controlled by a pair of specialised cells known as guard cells. These cells swell to close the pore and shrink to open it. Stomata are found mainly on the underside of leaves. Magnification x17250 (x4245 at 10cm wide).
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