Eating the inner bark of certain trees is something that is often referred to as a “good” source of food in survival situations, especially in the winter when not much else is available. The inner bark layer of a tree overlaps with the phloem on the tree, the phloem carries nutrients up and down the trunk from roots to leaves in the spring and from leaves to roots in the summer and fall so it makes sense that some of these sugars and starches would remain in this part of the tree over the winter.
1. Elm Tree(Genus: Ulmus)
This plant is known to contain mucilage in the inner bark, this is a thickening agent that creates a gelatinous substance when added to water. So eating the inner bark of the elm does create a gelatinous substance which could be weird or offputting for some people. The taste of the inner bark is very pleasant and even a little sweet with no bitterness or bad aftertaste.