Section through leaf stalk of water lily

Section through leaf stalk of water lily

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Caption: Petiole of a water lily. Light micrograph of a transverse (cross) section through a leaf stalk of a water lily, Nymphaea sp. Here, large-diameter hollow tubes or vessels are seen within the petiole. These tubes are connected directly to large air spaces in the floating leaves, and they contribute to the plant's buoyancy. Hollow vessels also serve to transport air down to the submerged roots. The tubes are lined with epidermal cells and they are studded with hair-like trichomes. In Nymphaea the trichomes are encrusted with crystals of poisonous calcium oxalate, which probably serves to deter inquisitive burrowing insects. Magnification: x2.5 at 35mm size.

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Keywords: botany, leaf, leaf stalk, light micrograph, lily, nature, nymphaea sp., petiole, plant, plants, stem, trichome, water lily

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