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In France, where wild mushrooms are very popular, all pharmacists are required to be able to expertly identify mushrooms. Many species are deadly, that is no joke, some are highly poisonous. People die here in France every year from mushroom poisoning.I personally would not even rely on a field guide, here people will ask an "old boy" who has years of experience of what mushrooms you can eat. You really have to be able to look at them, and smell them too.I think they will end up on the compost....
I've had a good look on a mushroom site and Yellow Stainers resemble field mushrooms but they are not staining yellow when cut or bruised.. soooooooo hopefully i'll still be here tomorrow after trying one tonight with an update!!
We've been to the mushroom museum near Saumur http://www.musee-du-champignon.com/index.php where they have literally thousands of varieties on display, with comments on their edibility.It may be a false memory, but I'm convinced that one of the exhibits is labelled "Delicieux mais mortel".