DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Blackcurrant plant stem. Light micrograph of a cross-section through the stem of a blackcurrant (Ribes nigrum) plant. The outer cortex (blue and pale brown) is made of cork cambium tissue, beneath which is a ring of phloem and sieve tube bundles (brown). Under this is a ring of cambium (blue) and then woody fibres (blue and pale brown). The solid pith (centre, blue and dark brown) is composed of large parenchyma cells. Magnification: x14 when printed 10 centimetres wide.
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