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A vascular bundle is a part of the transport system in vascular plants. The transport itself happens in vascular tissue, which exists in two forms: xylem and phloem. Both these tissues are present in a vascular bundle, which in addition will include supporting and protective tissues. The xylem typically lies adaxial with phloem positioned abaxial. In a stem or root this means that the xylem is closer to the centre of the stem or root while the phloem is closer to the exterior. In a leaf, the adaxial surface of the leaf will usually be the upper side, with the abaxial surface the lower side.
cambium-a formative one-cell layer of tissue between xylem and phloem in most vascular plants that is responsible for secondary growth. fibrovascular bundle, vascular bundle, vascular strand-a unit strand of the vascular system in stems and leaves of higher plants consisting essentially of xylem and phloem.. 1. (Botany) tissue of higher plants consisting mainly of xylem and phloem and occurring as a continuous system throughout the plant: it conducts water, mineral salts, and synthesized food substances and provides mechanical support.