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Water milfoil stem, light micrograph

Water milfoil stem, light micrograph

C003/6047

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Credit

DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY

Caption

Water milfoil stem. Light micrograph of a transverse section through the stem of the aquatic whorled water milfoil (Myriophyllum verticillatum) plant. All aquatic plants (hydrophytes) have a similar stem structure. The epidermis has a thin cuticle and is permeable to water. The vascular tissue (centre) acts as a cable to resist the movement of water. Below the outer endodermis (purple ring) is a ring of phloem (small dark blue cells) and an inner thin ring of xylem (large circles). The pith consists of large-celled parenchyma (deep blue). Magnification: x14 when printed 10 centimetres wide.

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