Section through wood of Elm tree

Section through wood of Elm tree

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Credit: SCIENCE PHOTO LIBRARY

Caption: English elm wood. Polarised light micrograph (PLM) of a tangential longitudinal section through wood of the English elm tree, Ulmus procera. Running top to bottom (yellow) are thick-walled xylem vessels known as tracheids. Between some of the tracheids are lenticular-shaped medullary rays (purple) seen in cross-section. The rays consist of rounded parenchyma cells that form radial lines perpendicular to the tracheids. Tracheids function in conducting water up the stem, as well as giving mechanical support to the tree. The ray system is thought to transport water across the wood. The English elm if often used for timber. Magnification: x12.5 at 35mm size.

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Keywords: botany, elm, english, english elm, english elm tree, nature, plant, plants, ray, sieve element, tangential section, tracheid, ulmus procera, wood, xylem

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