Section through wood of Ash tree

Section through wood of Ash tree

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Credit: ALFRED PASIEKA/SCIENCE PHOTO LIBRARY

Caption: Ash wood. Light micrograph of a cross-section through wood of the Ash tree, Fraxinus excelsior. Here, empty thick-walled xylem tubes (white) known as tracheids are seen, each formed from a single cell. Their walls are strengthened with lignin (red). Tracheids comprise the non-living element of wood and function in the conduction of water up the stem, as well as giving mechanical support to the tree. Medullary rays (pink) run diagonally across this field of view, and consist of rounded parenchyma cells that form radial lines perpendicular to the tracheids. The ray system is thought to transport water across the wood. Magnification: x200 at 4x5 inch size.

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

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