Photo by Robert Briggs

Crowded Parchment (Stereum complicatum) is a common, widely distributed, wood decaying, bracket fungi. It is found from spring through fall as fused masses or dense, overlapping clusters on stumps, logs, and sticks of hardwood trees, especially oak.

The fruiting body is sometimes a thin, semicircular or fan-shaped bracket (cap), but very often it lies flat without a well-defined cap, with the margins free and folded inward. The upper surface is concentrically zoned with shades of orange, orangish-brown, tan, pinkish, or cinnamon. The under surface is bright orange and smooth, with no layer of pores or tubes. The flesh is thin, tough, and inedible.

http://www.minnesotaseasons.com/Fungi/Crowded_Parchment.html