Pine stem, light micrograph

Pine stem, light micrograph

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Caption: Pine stem. Polarised light micrograph of a section through part of the stem of a pine (Pinus sp.) tree, showing the growth rings. From outer to inwards: outer layer of cork (brown); cortex - made up of parenchyma cells (red) with resin canals; ring of secondary phloem composed of sieve cells (blue), parenchyma and albuminous cells (red); vascular cambium cells (blue); xylem - with ten growth rings each made up of large thin-walled tracheid cells (light brown) of spring wood, and smaller thick-walled tracheid cells (dark brown) of autumn wood; thin files of parenchyma and tracheid cells (brown). The xylem includes large circular resin canals (lacunae, green) Magnification: x13 when printed 10 centimetres wide.

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Keywords: albuminous, autumn wood, biological, biology, botanical, botany, cambium, canals, cell, cell biology, cells, close-up, cork, cortex, cut out, cut-out, cut-outs, cutout, cutouts, cytological, cytology, detail, duct, ducts, growth ring, gymnosperm, gymnosperms, histological, histology, lacuna, lacunae, light micrograph, light microscope, microscopy, parenchyma, pine, pinus sp., plant, plants, polarised light, resin canal, rings, secondary phloem, section, sectioned, sieve tube, spring wood, stain, stained, stem, structural, structure, structures, tissue, tracheid, tracheids, tree, trunk, tubes, vascular, white background, wood, xylem tissue

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