All tree leaves have an outer layer called the epidermis, which can also be used in the identification process. This leaf "skin" always has a waxy cover called the cuticle and varies in thickness.

White, waxy skin, top layer feels hard, rubbery but deeper tissue is still soft ; Numbness ; Most typically seen on cheeks, earlobes, fingers, and toes ; Treatment. Rewarm the area gently, generally ...