This document provides information about poisonous mushrooms, including their identifying features, seasons, and symptoms caused by their toxins. It describes several deadly mushroom species that contain amatoxins and cause liver and kidney failure, such as the death cap and destroying angel. It also mentions other toxic mushrooms like the fool's mushroom that can cause symptoms ranging from nausea to hallucinations. Finally, it classifies toxic mushrooms into groups based on the toxins they contain such as cyclopeptides, orellanine, muscarine, and isoxazoles.