Pine stem, light micrograph

Pine stem, light micrograph

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Caption: Pine stem. Polarised light micrograph of a section through a single annual growth ring in the stem of a pine (Pinus sp.) tree, showing xylem tissue. The large thin-walled tracheid cells (blue) are of younger spring wood, whilst smaller thick-walled tracheid cells (yellow-orange) are of older autumn wood. There are thin files of parenchyma and tracheid cells (yellow-brown) of the subsidiary medullary rays, which pass food substances radially. Many of the tracheid cell walls have bordered pits (oval, 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, pine, pinus sp., pits, plant, plants, polarised light, ray, section, sectioned, spring, stain, stained, stem, structural, structure, structures, subsidiary ray, thick-walled, thin-walled, tissue, tracheid, tracheids, tree, trunk, vessel, vessels, wood, xylem tissue, young, younger

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