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I found what appeared to be some species of white Amanita's fruiting on the edge of a cow field near a cedar tree fenceline. They were HUGE with some measuring about 10 inches across the cap. It was a pretty patch if nothing else ...I wish I had gotten a picture...just for looks. They had gigantic stems you could barely fit your hand around all the way(perhaps 6' diameter), fairly short for their girth at about 6-8 inches off the ground, attached thick white viel almost corky looking, very LARGE white caps with yellowish warts, and closely nit white to light greenish gills(only a few had greenish tinted gills..perhaps rotting with age). They looked like albino Amanita Muscaria almost. I would never think of taste testing an Amanita myself and I doubt I'd ever even try 100% identified Amanita Muscaria, but if anyone thinks they know what species these were feel free to speak up..I'm just curious. These were found in middle Tennessee btw.
"That is not dead which may eternal lie..and with strange eons even death may die."
Not to be a nag, but there are many species of Amanita that will surely kill a person. Ex:A.verna A.virosa A.phalloides.
And destroying angels probably do taste really good, but you'll die if you eat them. You said you wouldn't eat anything but pos.i.d. on A. muscaria, so you're alright.
Species of Lepiota look somewhat similar to Amanitas and grow in the same fashion. Some seem to have warts on the caps as well. Considering the fact that it's growing on the edge of a cow field and shaded, with greenish-tinted gills, there is a possibility that it's a Morgan's Lepiota(poisonous to eat). Otherwise, it could be a rotted Amanita like you stated.
Even the deadly Amanitas start with an egg-like structure. The egg sort of exploded, then the remnants of the universal veil stick to the cap. The white-capped destroying angels have warts sometimes, also, but may not be seen because of the white-on-white factor. The yellowing could be a form of rot, again, like you said.
Hope that helps alittle.
Like Levi said, sounds like a green gill lepiota. Amanita doesn't like cedar mulch/chips(no fungus does) and its unlikely you would find one in a pasture(although it does happen, found a few the other day in the field)