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Elm stem, light micrograph

Elm stem, light micrograph

C003/4146

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Credit

DR KEITH WHEELER / SCIENCE PHOTO LIBRARY 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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