Moss can actually grow on the north, east, south, west, or the entire tree.
I think if you're lost and were to use this as your only means of direction, you have to take a look at many trees in the forest to see if moss is all on the same side --- in which case it's likely to be out of the northsomething.
But if you just look at one tree, you're going to get even more twisted around.
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