SUGi Tree Guide: Tree Bark
Like our skin, the bark of a tree is its protective outer layer. It consists of the outer bark, and several layers and tissues.
Acting as a barrier between its inner living tissues and the external environment, it serves many functions:
Bark Type: Smooth
American beech
(Fagus grandifolia)
Young trees often have smooth bark, but this often changes as they age. American beech is an example of a tree that keeps its smooth bark throughout its lifespan. The smoothness of the bark prevents certain insects and other plant species like ivy from gripping onto it.
Bark Type: Peeling
Paperbark Maple
(Acer griseum)
Some tree species shed thin layers of bark as they grow. It’s a natural part of their maturation process that can also protect them from infestations of lichen and moss.
Bark Type: Furrowed
Red oak
(Quercus rubra)
Thick bark is often important for protection against fire, and retaining water in dry environments. Deep furrows provide flexibility and space for the tree to grow.
Bark Type: Fibrous
Giant Sequoia
(Sequoiadendron giganteum)
The fibrous bark of the giant sequoia reinforces the strength of the tree, and helps with its structural stability. Fibrous bark helps with thermoregulation, fire protection, and water retention.
