Wood of the Scots pine

Wood of the Scots pine

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: Scanning electron micrograph of a horizontal section through the wood (secondary xylem) of the Scots pine, Pinus sylvestris. The large-celled wood at top is early (spring) growth; the late wood (bottom) has small, thick-walled cells and is much denser. The holes seen in both types of wood are the cut ends of vertical tube-like structures known as tracheids. In softwoods like pine, these carry out both sap-conducting and mechanical functions; the large early tracheids are primarily concerned with conduction, whereas the smaller late ones act primarily as structural elements. Several rays appear as narrow vertical lines in the image. Magnification: x200 at 8x10 inch size.

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Keywords: botany, nature, pine, pinus sylvestris, plant, plants, ray, scanning electron micrograph, scots, scots pine, secondary xylem, sem, softwood, tracheid, type, wood

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