Water lily leaf stalk, light micrograph

Water lily leaf stalk, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Water lily leaf stalk. Light micrograph of a transverse section through the leaf stalk (petiole) of a water lily (Nymphaea sp.). All aquatic plants (hydrophytes) have a similar structure. The epidermis of the petiole has a thin cuticle (outer layer) and is permeable to water. The whole petiole consists of parenchyma cells with large air spaces (lacunae, white circles). The vascular bundles consist of a lysigenous xylem canal (green ring of cells around a cavity) and phloem (dark-green ovals either side of small green cells). The parenchyma tissue contains thick-walled sclereids (deep red) with pointed arms for support. There is no central pith. Magnification: x14 when printed 10 centimetres wide.

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Keywords: air space, angiosperm, angiosperms, aquatic, biological, biology, botanical, botany, bundle, bundles, canals, cell, cell biology, cells, cut out, cut outs, cut-out, cut-outs, cuticle, cutout, cutouts, cytology, epidermis, flora, hydrophyte, hydrophytic, intercellular, lacuna, lacunae, leaf stem, light micrograph, light microscope, lm, lysigenous xylem canal, nature, nympha sp., parenchyma, permeable, petiole, phloem, plant, plant structure, sclereid, sclereids, section, sectioned, spaces, support, supportive, vascular bundle, vascular tissue, water lily, white background

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