Hypomyces hyalinus
Westboro 8/5/07

Very stout and wedge shaped.  As shown it is 5" high with a 2.25" stem and 2.75" cap.  It is 1.75" deep on the bottom and 1" deep on top.

Close-up of the "cap".

According to Roger Phillips's book the Amanita that was attacked was rubescens, flavorubescens, frostiana, or bisporigera.