 The bacterium "Paenibacillus tylopili" has been isolated from the mycorrhizosphere of "T. felleus"; this is the region around its subterranean hyphae where nutrients released from the fungus affect the activity of the microbial population in the soil.The bacterium excretes enzymes that allow it to break down the biomolecule chitin.Fruit bodies of "T. felleus" have a high capacity to accumulate radioactive caesium (137Cs) from contaminated soil, a characteristic attributed to the deep soil penetration achieved by the mycelium.