Stinging nettle stem, light micrograph

Stinging nettle stem, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Stinging nettle stem. Polarised light micrograph of a transverse section through a stem of the stinging nettle plant (Urtica dioica). The layers from outer to centre (some very thin) are an epidermis (outer layer), collenchyma (light-blue), parenchyma (black with starch grains), phloem fibres (bright blue), phloem (dark yellow), cambium (violet), and xylem (yellow). There are medullary rays (black) in the xylem. The pith has broken down, leaving a central gap. Magnification: x5.5 when printed at 10 centimetres wide.

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Keywords: anatomical, biological, biology, botanical, botany, cambium, cell, cells, cellular, collenchyma, cross-section, cut out, cut outs, cut-out, cut-outs, cutout, cutouts, epidermis, flora, gap, hole, internal structure, light micrograph, light microscope, lm, medullary ray, medullary rays, nature, parenchyma, part, parts, phloem, pith, plant, plant anatomy, polarisation, polarised, polarization, polarized, section, sectioned, starch grains, stem, stinging nettle, structural, tissue, transverse, urtica dioica, xylem

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