Pondweed stem, light micrograph

Pondweed stem, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Pondweed stem. Light micrograph of a transverse section through the stem of a pondweed (Potamogeton sp.) plant. All aquatic plants (hydrophytes) have a similar stem structure. The epidermis of the petiole has a thin cuticle (outer layer) and is permeable to water. The cortex consists of parenchyma cells with large air spaces (lacunae, white circles). The vascular cylinder (dark patch, centre) acts as a cable to resist the movement of water. The outer endodermis (black ring) encloses a ring of phloem (brown-red) and scattered xylem cells with large cavities. There is no pith. Magnification: x103 when printed 10 centimetres wide.

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Keywords: air space, angiosperm, angiosperms, aquatic, biological, biology, botanical, botany, cell, cell biology, cells, cut out, cut outs, cut-out, cut-outs, cuticle, cutout, cutouts, cylinder, cytology, epidermis, flora, hydrophyte, hydrophytic, intercellular, lacuna, lacunae, light micrograph, light microscope, lm, nature, parenchyma, permeable, phloem, plant, plant structure, pondweed, potamogeton sp., section, sectioned, spaces, stem, support, supportive, vascular bundle, vascular tissue, white background, xylem

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