Bark's the outermost layers of stems and roots of woody plants. Plants with bark include trees, woody vines and shrubs. Bark refers to all the tissues outside of the vascular cambium and's a nontechnical term. It overlays the wood and consists of the inner bark and the outer bark. The inner bark, which in older stems's living tissue, includes the innermost area of the periderm. The outer bark in older stems, includes the dead tissue on the surface of the stems, along with parts of the innermost… (More on Periderm)