Someone told me the moss/algae/something on this tree is making it sick. It seems to be the case, as the moss covered areas seem to be dry/dead. And they also pointed out that sprouting at the base of the trunk is another sign of sickness.
Then I did some web searching and read some contradictory information, that moss/lichen is normal, etc.
Now I'm confused. Is the growth on the tree normal? And if not, is there a way to remove it so the tree can be healthy again?