It's in Atlanta, Georgia, USA. It's growing under a Live Oak tree, in an area of wood chips and dead leaves, taken in early autumn. It was by itself, with no others around. http://www.flickr.com/photos/mjn9/2951659749/in/photostream
Agree with the ganoderma. Can you tell the color underneath if it's fresh? Right now Ling Chih or Ganoderma Lucidum is very populous. Not sure about the colors though...sometimes with age comes the fading...or maybe another parasitic fungus has attached to it?
