For the last few weeks I've noticed these little brown patches on some green fuzzy shrooms. At first I thought it was a type of algea, but noticed that they would come and go, usually appearing in the late afternoon and going away after dark. Then I noticed them moving slightly.
After a coulple weeks I noticed that there were a few of these brown patches on a couple other mushroom colonies.

I took a turkey baster and blew them off the colonies. They would twist and flutter as they floated around. They are very small, slightly bigger than the tip of a pen. I was able get one, here is a pic.

Any ideas what they might be?