Lime tree stem, light micrograph

Lime tree stem, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

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Caption: Lime tree stem. Light micrograph of a transverse section through the one-year-old woody stem of a lime (Tilia cordata) tree. The outer layer is cork (brown), underneath which is a layer of collenchyma (yellow-green). The lower cortex has bands of phloem fibres (red-brown), between which are phloem sieve tubes (green). Under the phloem is a ring of cambium (brown circle) and a thick ring of wood (xylem, brown-green) composed of xylem vessels (large circular holes) and tracheid cells. The medullary rays (radial lines, yellow-green) transport water and minerals to the outside of the stem. The solid pith (bottom left) is composed of parenchyma cells (green-yellow). Magnification: x46 when printed 10 centimetres wide.

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Keywords: angiosperm, angiosperms, biological, biology, botanical, botany, cambium, cell, cell biology, cells, cork, cortex, cut out, cut outs, cut-out, cut-outs, cutout, cutouts, cytology, fibres, flora, growth ring, inner cortex, light micrograph, light microscope, lime tree, lm, nature, one-year-old, parenchyma, pith, plant, plant structure, plates, primary phloem fibre, rings, section, sectioned, sieve plate, stem, support, supportive, tilia cordata, tracheid, tracheids, vessels, white background, xylem vessel

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