Forest with pine trees and grass filmed with dolly. Pine tree trunk in dense forest. Coniferous trees. Bark is the outermost layers of stems and roots of woody plants. It overlays the wood and consists of the inner bark and the outer bark. The outer bark in older stems includes the dead tissue on the surface of the stems, along with parts of the innermost periderm and all the tissues on the outer side of the periderm. Slider natural bird sounds nature. The outer bark on trees which lies external to the last formed periderm is also called the rhytidome. UHD 4K 3840×2160.