Section through stem of Scots pine

Section through stem of Scots pine

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Credit: ALFRED PASIEKA/SCIENCE PHOTO LIBRARY

Caption: Pine stem. Polarised light micrograph of a cross- section through the stem of a Scots pine, Pinus sylvestris. At upper right is the outer layer of bark (blue). Tracheid (xylem) cells of the pine wood are seen at left, consisting of concentric layers which correspond to annual growth rings (a count of which would indicate the age of the tree). In the wood, large cells (purple) represent early (spring) growth; winter wood (pink bands) contain small, dense, thick-walled cells. In soft- woods like pine, tracheids of the wood carry out both a sap-conducting function and give strength to the stem. Scots pine wood is of commercial value. Magnification: x18 at 6x7cm size.

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Keywords: bark, botany, growth ring, nature, pine, pine tree, pinus sylvestris, plant, plants, scots, scots pine, tracheid, type, wood

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