DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Sycamore stem. Light micrograph of a vertical section through a sycamore (Acer pseudoplatanus) stem node. The red layer at the edge of the stem is a protective layer of cork and parenchyma tissue (phellogen), known as the abscission layer, that forms just prior to the leaves dropping in autumn.
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