See the TED talks by Paul Stamets or the books on the subject by Stamets & Wu. Mushrooms actually dis-assemble many toxins – such as TNT and PCBs – making them safely edible. They are both the oldest organized organisms and the largest – with one colony in the Pacific Northwest known to be at least 26 square miles. Of especial interest, it has a communication network with damage in one place almost instantly triggering the movement of nutrients from the rest of the organism to the point of injury to stimulate regrowth.