Monocotyledon root vascular bundle. Coloured scanning electron micrograph (SEM) of a section through a vascular bundle from a monocotyledonous root. The vascular bundle, which consists of xylem ( larger vessels) and phloem tissues. Xylem transports water and mineral nutrients from the roots throughout the plant and phloem transports carbohydrate and hormones around the plant. Endodermis and pith surround the vascular bundles. Magnification: x600, when printed 10 centimetres wide.