DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Stinging nettle leaf. Polarised light micrograph of the underside of a stinging nettle (Urtica dioica) leaf. Two types of hairs are seen, the hairs with a bulbous base are the stinging hairs and the smaller curved ones are non-stinging hairs. This image was created using an epithelial peel to chemically remove the top layer of the leaf. Magnification: x44 when printed at 10 centimetres tall.
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