DENDROLOGY

Detailed explanation-1: -Cambium Layer : It is a thin layer of sap between sapwood and inner bark.

Detailed explanation-2: -The inner soft bark, or bast, is produced by the vascular cambium; it consists of secondary phloem tissue whose innermost layer conveys food from the leaves to the rest of the plant. The outer bark, which is mostly dead tissue, is the product of the cork cambium (phellogen).

Detailed explanation-3: -Finally, cambium is also called the inner bark, which is the layer found between the dead, outer bark, and sapwood. The sapwood is found between the cambium and the heartwood at the core of the trunk.