Are some mushrooms poisonous even before they deteriorate?

Yes. In fact, another word for mushroom—toadstool—comes from a German word meaning “stool of death.” It’s extremely difficult to tell a poisonous mushroom from a nonpoisonous one even for experienced collectors, so don’t pick your own; get your mushrooms from the store.
 
Source(s):
Food Alert! by Morton Satin, 2008.   

 
 

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