Elm stem, light micrograph

Elm stem, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Elm stem. Light micrograph of a transverse section through the one-year-old woody stem of an elm (Ulmus procera) tree. The outer layer (epidermis, dark ring) is being sloughed (pushed/broken) off by developing underlying cork (red-brown), underneath which is the cortex made of collenchyma (orange-red). The lower cortex has bands of phloem fibres (red) and a layer of phloem sieve tubes (solid red with cavities). Under the phloem is a ring of cambium (light-red circle) and under this is a thick layer of wood (xylem, purple-red) with six vascular bundles. The solid pith (pink, centre) is composed of parenchyma cells. Magnification: x46 when printed 10 centimetres wide.

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Keywords: angiosperm, angiosperms, biological, biology, botanical, botany, cambium, cell, cell biology, cells, collenchyma, cork, cortex, cytology, elm tree, fibres, flora, inner cortex, light micrograph, light microscope, lm, nature, one-year-old, parenchyma, pith, plant, plant structure, primary phloem fibre, rings, section, sectioned, sieve tubes, stem, support, supportive, tracheid, tracheids, ulmus procera, vessels, white background, xylem vessel

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