RICHARD KIRBY, DAVID SPEARS LTD / SCIENCE PHOTO LIBRARY RICHARD KIRBY, DAVID SPEARS LTD / SCIENCE PHOTO LIBRARY
Light micrograph of a transverse section through a young sycamore stem, Acer pseudoplatanus. The stem is composed of concentric layers of different types of tissue. Starting from the centre and working outwards these are: the pith or medullary parenchyma (blue, large-celled, centre), xylem (pink & white with fibrous appearance), phloem (dark band), phloem fibres (broken pink band), cortex (dark band) and, finally, the epidermis (thin outer "skin"). Magnification: x4 at 35mm size.
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