Brown Roll-Rim (Paxillus involutus) is a dangerous poisonous mushroom with symptoms of poisoning which occur a few hours after consumption. Repeated consumption may cause sensitization to a heat-stable toxin, resulting in haemolysis which may be of all degrees. In addition, severe gastrointestinal symptoms may be due to a heat-instable toxin. In cases with immune haemolysis, treatment consists of corticosteroid and possibly plasmapheresis and symptomatic therapy.