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 is a complex tissue and characteristic of vascular plants. The two main components of vascular tissue are the xylem and phloem. The vascular tissue in plants is arranged in long, discrete strands called vascular bundles. These bundles include xylem and phloem, as well as supporting and protective cells.clerenchyma Mature sclerenchyma is composed of dead cells with extremely thick secondary walls cell walls composed of cellulose and lignin: these walls make up to 90% of the whole cell volume. Sclerenchyma tissue is a supporting tissue. There are two types of sclerenchyma cells, fibres and sclereids.