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Are you sure that only PART of body of mushroom is eaten by wild animals? Maybe they are eaten as whole and all mushrooms under a tree is eaten as well. Anyway there is - as far as I know and as I cited a research in my previous post - not known case of poisoned wild animals due eating mushrooms.
Well, as the fruiting body can be destroyed without killing the mushroom, it doesn't matter. Also, what the hell is that last sentence saying? Is it claiming that no wild animal has ever been killed by a poisonous mushroom? Because that's bullshit.
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One of the most poisonous mushroom Amanita phalloides has its cap mostly green. The color could be - I dare say - in grass and forest perceived as cryptic. Poison take effect after many hours and not instantly. Any darwinstic explanation of "survival advantage"?
Well, the color makes it less likely to be eaten. If it is eaten, the fungus will likely survive. The poison? Well, most things that eat fungi are small, and thus will die far more rapidly than humans, due to the lower amount of toxins that are needed for a lethal dose. It's pretty basic stuff.