Pine stem, light micrograph

Pine stem, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Pine stem. Light micrograph of a section through a single annual growth ring in the stem of a pine (Pinus sp.) tree, showing large thin-walled tracheid cells (whitish pink) of younger spring wood and smaller thick-walled tracheid cells (bright white) of older autumn wood. The large circular lacuna (resin duct, centre) is lined with parenchyma cells (orange-brown). Magnification: x70 when printed 10 centimetres wide.

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Keywords: autumn, biological, biology, botanical, botany, canal, cell, cell biology, cells, close-up, cytological, cytology, detail, growing, growth ring, gymnosperm, gymnosperms, histological, histology, lacuna, light micrograph, light microscope, microscopy, old, older, parenchyma, pine, pinus sp., plant, plants, resin duct, section, sectioned, spring, stain, stained, stem, structural, structure, structures, thick-walled, thin-walled, tissue, tracheid, tracheids, tree, trunk, wood, young, younger

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