I checked the fern/lichen/moss/mushroom forum and it's dead in there, so hopefully I won't get in trouble for posting this here...
I found the craziest mushroom in one of my tree wells today. It's an oak tree (don't know the species) with a fairly heavy mulch of composted chicken bedding, i.e. pine shavings full of chicken poop. Has anyone seen one of these before? Anyone know what the heck it is? After doing some googling I'm going to guess it's a "false truffle" of some kind. It was a little smaller than my fist.