Lucy68 said: No, your tree is not dying. Its damp enough at your house to grow lichens though. Lucky you!
Lucy68 said: What kind of tree is it?
jasontaylor7 said: It has leaves and all, but some branches sometimes fall in high winds, and this is an example.
stone said: In my experience, a tree that is growing lichen and dropping branches probably has issues in the root zone....Can only suggest doing better soil prep with any future trees.
jasontaylor7 said: Stone, is it true that you disagree with Lucy? That is to say, you think lichen isn't good for a tree, and that really healthy trees don't have it?
Many lichens are more evident on stressed or old tree trunks and branches giving the appearance of a "cause and effect" association with disease and decay. The primary reason for their more likely presence on those trees and branches with reduced or partial foliation is the resulting increase in available sunlight. The bark of a healthy tree continues to expand and slough off with the growth of the tree. The bark of an older or stressed tree may become more brittle with more cracks and uneven surfaces permitting lichens to attach themselves more readily. As bark ages, it changes in chemistry, texture, and ability to retain water, thereby influencing the type of lichen capable of living there.
Lichens are often found on tree trunks, branches and twigs as the bark provides a stable place to reside to collect needed sunlight, rainwater and materials from the air. They grow on healthy trees, as well as stressed or otherwise unhealthy ones. The appearance of colorful organisms growing on the bark of trees or shrubs in the landscape sometimes causes concern for the homeowner. Homeowners may find lichens mysterious and incorrectly associate them as the cause of plant diseases or misidentify them as a type of moss.
Still, some of the branches that fall down seem extremely fragile and crumbly.Those are DEAD branches, and seemingly already partially decomposed while still attached to the tree. The presence of lichens is not an indication of causation. The lichens could have started growing on that branch AFTER the tree stopped supplying water/nutrients to that branch, and were mere hangers-on as the appendage finally dropped. Larger trees shed interior branches all the time, as their crown/canopy increases and the interior branches are no longer "holding their own" or "carrying their weight" because of decreased ability to photosynthesize adequately.