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.
The vascular tissue system is composed of the xylem (transport of water and dissolved minerals) and phloem (transport of food-usually sucrose and other sugars-, nitrogen containing compounds, and hormones). The xylem and phloem in the primary plant body are usually closely associated in the form of vascular bundles.he vascular tissue system is composed of the xylem (transport of water and dissolved minerals) and phloem (transport of food-usually sucrose and other sugars-, nitrogen containing compounds, and hormones). The xylem and phloem in the primary plant body are usually closely associated in the form of vascular bundles.