DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
False-colour scanning electron micrograph of a cut stem of the white dead nettle, Lamium album. The hollow centre is produced by the collapse of thin- walled pith cells. Surrounding this core is a layer of unspecialised cortical cells - the cortical parenchyma. Eight vascular bundles serve to conduct water & nutrients: one near each of the 4 corners, & one half way along each side of the stem. In the extreme corners of the stem, the best position mechanically, small collenchyma cells are visible. The spikes on the outside of the stem are hairs, designed to discourage insects from climbing the plant. Magnification: x6 at 35mm size. Yellow tint. Reference: MICROCOSMOS, figure 4.6, page 70.
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