What is the green-colored organism growing up the tree trunks on the bark?

In the northern hemisphere if you are lost in woodland the lichen grows on the north side of trees (less sunlight)

I have them growing on all my trees in rural n.j.

Bernie881, I have been told this also.

🎶you say Lichen (litchen) I say Lichen (liken) lets call the whole thing moss🎶