POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Scanning electron micrograph (sem) of the epidermis of an oak leaf (Quercus robur) showing stomata and trichomes. 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. Trichomes are hair-like epidermal attachments of varying shape, structure and function. The star shaped trichome is of a stellate structure and is very different to the 3 dehydrated uniseriate trichomes. Magnification x1830 (x450 at 10cm wide).
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