DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Lime tree stem. Light micrograph of a section through the stem of a lime tree (Tilia europaea). From left to right: outer epidermis, which has been shed and replaced by a layer of cork (dark red). Next to the cork is the cortex, a layer of flexible collenchyma tissue (dark blue and red); parenchyma tissue (blue). Next there is a ring of phloem (blue) with long large sieve tubes, companion cells and fibres (pink). Then a ring of xylem (light pink) with large files of vessels with reticular walls and small rectangular cells of woody parenchyma tissue (dark red-brown). Magnification: x37 when printed 10 centimetres wide.
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