the world > plants > part of plant > part of tree or woody plant > wood > [adjective] > of or relating to bark > under the bark (2)
Situated between the skin and flesh; subcutaneous. Also, lying between the bark and stem of a tree.
Botany and Ecology. Lying, situated, or formed under the bark of a tree, the cortex of a lower plant, etc. Also (of an insect, fungus, etc.): living…