The Toughest Biochemical Substance Ever Discovered

Mushroom spores are made of the toughest biological substance known. Butter is a completely edible mushroom, although it can kill an adult human. Sporel pollinate Bob and Jay? I think this one is fiction. You don't eat the spores. You eat the fruit of the mushroom, not the spores. The single gram of tremella mesenterica is sufficient to kill a large adult human.