Pine stem, light micrograph

Pine stem, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Pine stem. Polarised light micrograph of a section through a growth ring in the stem of a Scot's pine (Pinus sylvestris) tree, showing thick-walled tracheid cells (yellow-orange) of older autumn wood. There are thin files of parenchyma and tracheid cells (horizontal, dark) of the subsidiary medullary rays, which pass food substances radially. Many of the tracheid cell walls have bordered pits (circles, yellow-brown) that pass water and minerals side-ways. Magnification: x32 when printed 10 centimetres wide.

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Keywords: autumn, biological, biology, bordered pit, botanical, botany, cell, cell biology, cells, close-up, cytological, cytology, detail, growing, growth ring, gymnosperm, gymnosperms, histological, histology, light micrograph, light microscope, medullary rays, microscopy, old, older, parenchyma, pinus sylvestris, pits, plant, plants, polarised light, ray, scot'ss pine, scots, section, sectioned, stain, stained, stem, structural, structure, structures, subsidiary ray, thick-walled, tissue, tracheid, tracheids, tree, trunk, vessel, vessels, wood, xylem tissue

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