 A fatal dose has been calculated as 15 caps . Deaths from this fungus A. muscaria have been reported in historical journal articles and newspaper reports , but with modern medical treatment , fatal poisoning from ingesting this mushroom is extremely rare . Many older books list Amanita muscaria as " deadly " , but this is an error that implies the mushroom is more toxic than it is . The North American Mycological Association has stated there were no reliably documented fatalities from eating this mushroom during the 20th century . The vast majority ( 90 % or more ) of mushroom poisoning deaths are from eating the greenish to yellowish " death cap " , ( A. phalloides ) or perhaps even one of the several white Amanita species which are known as destroying angels . 
 A fatal dose <a href='been_done' title='1'><mark>has</mark></a> been calculated as 15 caps . Deaths from this fungus A. muscaria <a href='been_done' title='2'><mark>have</mark></a> been reported in historical journal articles and newspaper reports , but with modern medical treatment , fatal poisoning from ingesting this mushroom <a href='drop_aux' title='3'><mark>is</mark></a>extremely rare . Many older books list Amanita muscaria as " deadly " , but this <a href='drop_aux' title='4'><mark>is</mark></a>an error <a href='null_relcl' title='5'><mark>that</mark></a><a href='uninflect' title='6'><mark>implies</mark></a> the mushroom is more toxic than it is . The North American Mycological Association <a href='been_done' title='7'><mark>has</mark></a> stated <a href='dey_it' title='8'><mark>there</mark></a> <a href='uninflect' title='9'><mark>were</mark></a> no reliably documented fatalities from eating this mushroom during the 20th century . The vast majority ( 90 % or more ) of mushroom poisoning deaths are from eating the greenish to yellowish " death cap " , ( A. phalloides ) or perhaps even one of the several white Amanita species which are known as destroying angels . 
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