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This looks like Trichaptum biforme, the most common mushroom in our area. It has some concentric zones on the cap, an amethyst edge, and an underside that appears to be composed of spines. It is a polypore found on almost all kinds of standing and downed trees.
Lat: 40.87, Long: -73.92
Spotted on Oct 25, 2009 Submitted on Oct 25, 2009