Random examples of online collections of primary sources: 1  American Memory: Historical Collections for the National Digital Library. 2  Making of America: the Cornell University Library MOA collection. 3  Science Direct. 4  United States Historical Census Data Browser. 5  Valley of the Shadow: Two Communities in the American Civil War.
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.he 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.
Vascular tissue. The xylem and phloem that make up the vascular tissue of the stem are arranged in distinct strands called vascular bundles, which run up and down the length of the stem. When the stem is viewed in cross section, the vascular bundles of dicot stems are arranged in a ring. In plants with stems that live for more than one year, the individual bundles grow together and produce the characteristic growth rings.