The mushrooms are the reproductive structures of the fungi found on the ground or in the substrate while the true body of the fungus is composed of fine cellular threads that are called "hyphae" and that, together, are called "mycelium." The cells that make up the mycelium have very simple walls that behave like sponges, so that they absorb very easily the deposits of the soil to which they are accessing when growing. If fungi grow in a soil or medium contaminated by heavy metals, acid rain, slurry or any other type of pollution, they absorb them, show and accumulate in their structure.
This well -used phenomenon is called "soil bioremediation", which means that the fungus is cleaning the area of that pollution. The problem results whether the end of these fungi are the mushrooms that it produces for consumption. As a summary to say that consuming mushrooms that have the ecological production seal are guaranteeing that the soils where these mushrooms or the substrates in which they have been cultivated have been grown suffer exhaustive quality controls that allow us to enjoy with all tranquility of the wonderful delicacies that nature gives us every fall.