These fungi are generally tough and colored in layers that make them resemble the pattern of a turkey tail – loosely. The colors are remarkably variable. In this image you can’t see much of the the underside which has no gills. They have holes instead and are called Polypores.
This may be Gloeophyllum sepiarium – not a positive ID, however.
This picture was taken September 14, 2012, in Green Lane, Pennsylvania, USA.
Here’s a place you can get more info:
Here is an image showing a bit of the underside: