Tree fern frond midrib, SEM

Tree fern frond midrib. Coloured scanning electronmicrograph (SEM) of a section through the midribof a frond of a tree fern ( Dicksonia antarctica ).At centre is the vascular bundle, which consistsof xylem (red) and phloem (brown within red)tissues. Xylem transports water and mineralnutrients from the roots throughout the plant andphloem transports carbohydrate and hormones aroundthe plant. The surface of the leaf is covered in awaxy cuticle (green) that helps to prevent waterloss.. Stunning Photo Gifts From Science Photo Library

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