DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Elm stem (Ulmus procera) section, polarised light micrograph. The dark almond-shaped clusters of cells are multiseriate rays. The multicoloured patches are woody fibres, comprised of clusters of very small cells, which support the stem. Magnification: x100 when printed 10 centimetres high.
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