Stinging nettle root, light micrograph
Thin section through a stinging nettle (Urtica dioica) root, light micrograph. The section shows the inner lignified cells in red and the outer unlignified area in green. On the right side a branching root is visible. The tissue was stained with Acridine-red, Acriflavine and Aniline-blue. Magnification: x40 when printed 10 centimetres wide., by GERD GUENTHER/SCIENCE PHOTO LIBRARY
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