GERD GUENTHER / SCIENCE PHOTO LIBRARY GERD GUENTHER / SCIENCE PHOTO LIBRARY
Soft rush stem. Fluorescent light micrograph of a cross section through pith from a soft rush (Juncus effusus) stem. This star-shaped aerenchyma tissue allows gaseous exchange within the plant as well as providing buoyancy. Magnification: x175 when printed at 10 centimetres wide.
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