DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Dicotyledon plant stem. Light micrograph of a longitudinal radial section through a typical dicotyledon stem. The section has passed through a vascular bundle and other stem tissue (some of which have ring thickening, red). The tissue layers at right are mostly xylem and parenchyma. There is also a layer of cambium (light blue, centre). Several rows of phloem sieve tubes (yellow-green) are at centre left. At left are large parenchyma cells (blue) of the inner cortex of the stem. Magnification: x45 when printed at 10 centimetres high.
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