im guessing the perfectness of the conditions must be hard to come across for the organism,so when it does find a home,it beefs
up for protection..lets face it,its only protection in the wild is the fact it will fuck you up,something that might make you think twice before eating it again,but at that point its too late for the mushroom..so for natural enemys such as weather,they are very resilliant for the preservation of their species..at least thats my 2 cents on it...