Outermost layer of stems and roots in woody plants; all tissue outside the cambium.
Outer surface of the trunk of a tree or woody shrub.
They are all the tissues out side the cambium.
The outside covering of a woody stem.
The protective surface layer of the trunk or branches of a tree or shrub, generated from a layer of dividing cells at the bark-wood interface (cambium) and often from additional layers of dividing cells (cork cambium). Bark may build up in thickness as the tree grows, often becoming fissured or checkered as it is stretched; or outer layers of bark may be shed annually leaving a smooth new surface; or layers may peel in irregular flakes.