Next Slide Slide 56. Agaricus xanthodermus is one of the most frequently and strongly poisonous Agaricus species. It is readily identified because the flesh rapidly stains bright yellow when bruised, even without application of KOH solution. Vomiting can be severe and is accompanied by intestinal cramps, sweating at times, and sometimes diarrhea. Onset is generally about an hour after consuming the mushrooms.
Recovery is largely complete in a day.
Agaricus xanthodermus , except for the bright yellow staining and unpleasant odor, is easily confused with one of several different fine edible Agaricus species. This genus is not for the careless identifier or the unobservant.