Mushroom dipped in chocolate?

Of course not but it sure looks like it is.  Maybe some fungi experts can tell me what is happening here.  There was another mushroom of the same type nearby, the same size, but sans the "chocolate" coating.  Interesting.  September and October are mushroom months around here.  I wish I knew more about them.  Our cool mornings, warm afternoons continue, and I am loving every minute of it.