Hi Chris, just a guess but it looks like it may be related to the Lettuce Lichen shown at the bottom of this link. http://en.wikipedia.org/wiki/Lichen
I do believe you are correct, Frank. Thanks!
Chris, I would also agree that it is some form of lichen as the cilia (hairs) are very common on them. I did do a bit of research tonight into Florida lichen varieties, and could not find that particular type among those shown. Might not hurt for you to send a pic of it to the local Univ. and ask a botanist to ID it for you. Very well could be we're all wrong..lol
Also, moss will grow on any side of a tree that does get direct sunlight, so in a dense forested area the Sun is often blocked by other large trees, and the moss will grow on all sides. If the tree does get Sun, then it will be limited (generally) to the North side, so, if you're lost and need a direction, but sure to check a tree that is all alone and receives direct sunlight, and even then it may only be a relative indicator of where North is.
Mike