Elm stem, light micrograph

Elm stem, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Elm stem (Ulmus procera) cross-section, polarised light micrograph. At centre is the pith (blue), outside of which is a ring of wood (brown/yellow), indicating that the stem is one year old. It contains xylem vessels (large holes), which transport water and minerals throughout the plant. The green/red ring is the cambium, and above this is a second woody ring (yellow) containing phloem vessels, which transport carbohydrates and hormones around the plant. The outermost layer is bark, consisting of cork. Magnification: x44 when printed 10 centimetres wide.

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Keywords: anatomical, anatomy, angiosperm, angiosperms, bark, biological, biology, blue background, botanical, botany, cell, cells, cork, cortex, cross section, cross-section, dicot, dicotyledon, elm, flora, internal, light micrograph, light microscope, nature, phloem, pith, plant, plants, polarised, polarised light micrograph, polarized, sectioned, slice, sliced, stem, structure, structures, tissue, tissues, transverse, tree, ulmus procera, vascular tissue, vessel, vessels, wood, woody xylem, xylem

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