June Gallery
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1991 24 Hours of Le Mans
CIRCUIT DE LA SARTHE, FRANCE - JUNE 23: Teo Fabi / Bob Wollek / Kenny Acheson, Silk Cut Jaguar, Jaguar XJR-12, makes a pit stop at night during the 24 Hours of Le Mans at Circuit de la Sarthe on June 23, 1991 in Circuit de la Sarthe, France. (Photo by LAT Images)
© Motorsport Images
Action

Cut leaf stalk of water lily
False colour scanning electron micrograph of a section across a cut leaf petiole (stalk) of the water lily Nymphaea album. The water lily has overcome the difficulty of getting air to its submerged roots by having large diameter open tubes within the leaf petiole. These hollow tubes are connected directly to large air spaces in the leaves, which contribute to the plant's bouyancy. The tubes are lined with epidermal cells & studded with branched trichomes (hairs, centre). Some tubes contain crystals of calcium oxalate (not seen). Their function is unknown. Oxalate is poisonous & may act as a deterrent to burrowing animals. Magnification: x10 at 6x4.5cm size
© DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY