I’ve come to know these as Panther Caps, but apparently “true” American Panther Caps only happen in California. The only type that should be around here is Amanita velatipes, but they never seem to be “stocky” enough in comparative photos. However today I believe I have pegged them as A. ceciliae. This would explain why a number of them did not seem to have prominent rings (or in some cases rings at all).