Section through wood of Ash tree

Section through wood of Ash tree

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Caption: Ash wood. Light micrograph of a tangential longitudinal section through wood of the Ash tree, Fraxinus excelsior. Running top to bottom (blue) are thick-walled xylem vessels known as tracheids. Between some of the tracheids are lenticular- shaped medullary rays (brown) seen in cross- section. The rays consist of rounded parenchyma cells that form radial lines running perpendicular to the tracheids. Tracheids comprise the non- living element of wood and 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. Illuminated by cross polarisers. Magnification:x200 at 35mm size.

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Keywords: ash, ash tree, botany, fraxinus excelsior, light micrograph, nature, plant, plants, tangential section, tracheid, wood, xylem

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