Hen of the Woods
Grifola frondosa

I first found it in the middle of September 2003.  It was growing at the base of a White Oak.  Later they started appearing by Red Oak.  The largest clutch was 6 surrounding a large Red Oak.  Here is what they generally look like in this area:

Some I have found as far away as 8 feet from the base of the Oak.  These appear to camouflage themselves better: