 The phallotoxins consist of at least seven compounds , all of which have seven similar peptide rings . Phalloidin was isolated in 1937 by Feodor Lynen , Heinrich Wieland 's student and son @-@ in @-@ law , and Ulrich Wieland of the University of Munich . Though phallotoxins are highly toxic to liver cells , they have since been found to add little to the death cap 's toxicity , as they are not absorbed through the gut . Furthermore , phalloidin is also found in the edible ( and sought @-@ after ) Blusher ( Amanita rubescens ) . Another group of minor active peptides are the virotoxins , which consist of six similar monocyclic heptapeptides . Like the phallotoxins , they do not induce any acute toxicity after ingestion in humans . 
