Ash stem, light micrograph

Ash stem, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Ash stem. Light micrograph of a transverse section through the woody stem of an ash (Fraxinus excelsior) tree showing four growth rings (concentric circles). The outer layer is composed of cork (blackish-brown), underneath which is the cortex (red-purple), with primary phloem fibres (light red bundles) in the inner cortex. Under this is a layer of phloem sieve tubes with simple sieve plates (dark blue and deep red). Under the phloem is a ring of cambium (deep blue) and under this is a thick layer of wood (xylem, red). The solid pith (centre) is composed of parenchyma cells. Magnification: x14 when printed 10 centimetres wide.

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

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