 These toxic mushrooms resemble several edible species ( most notably caesar 's mushroom and the straw mushroom ) commonly consumed by humans , increasing the risk of accidental poisoning . Amatoxins , the class of toxins found in these mushrooms , are thermostable : they resist changes due to heat and so , unlike many ingested poisons , their toxic effects are not reduced by cooking . Some amatoxins will cause irritation and severe pain and even damage to the eyes and skin on contact . They can be absorbed through the skin leading to the same potentially lethal effects as ingestion or inhalation . 
