DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Elm stem (Ulmus procera) section, polarised light micrograph. The black horizontal lines are multiseriate rays, which are composed of several rows of cells. The vertical bands comprised of clusters of very small cells (light blue and yellow) are woody fibres, which support the stem. Magnification: x100 when printed 10 centimetres high.
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