Answer: Periderm
Explanation: Periderm represents the outermost layering of roots and stems of woody plants. Bark refers to the all the tissues, present outside the vascular cambium.
It is made up of an outer layer and an inner layer. The inner layer in the older trees is the living tissue which comprises the innermost region of the periderm.
The outer bark consists of the dead tissues in the older plants along with the parts of the inner most periderm.
