In the picture, the poisonous Chlorophyllum molybdites is on the left and the delicious edible mushroom Lepiota rhacodes is on the right. Several other edible Lepiota species can also be confused with Chlorophyllum molybdites , including the parasol mushroom Lepiota procera , and also Lepiota americana . In case you're looking for these in a field guide, some authors include these species in the genus Macrolepiota . The major difference between Chlorophyllum and Lepiota is that Chlorophyllum develops green tinted spores and a green spore print. Symptoms of Chlorophyllum molybdites poisoning are mostly gastrointestinal in nature.
Symptoms persist for up to six hours, and even longer in a few patients.
Nausea, vomiting and diarrhea complete the picture. The diarrhea can be explosive in nature and become bloody. So be very careful if you plan on eating any Lepiota species. Projectile diarrhea would not be very much fun. The North American Mycological Association keeps a Mushroom Poisoning Case Registry for North America, which was organized to collect and provide information on mushroom poisoning in North America.