Leucoagaricus rubrotinctus

In the Lepiota family, this is one of the more distinctive species. When young it is almost entirely coral pink or orangish brown, and has an egg-shaped to conical cap. As it matures, however, the cap color begins to break up, resulting in the familiar Lepiota family fibers and scales over a pale background. The center of the cap, however, remains evenly colored and dark, although the scaly fibers elsewhere may fade to orangish or coral pink.

The distinctive cap, together with the absence of any staining in the flesh, make Leucoagaricus rubrotinctus easy to recognize. Lepiota rubrotincta is a synonym, and is the name found in most field guides; see the comments below for the gory details.