Mycelium, toadstool, mushroom can be associated to various concepts.
Life and death or the cycle of life, health and sickness, or the association to nuclear weapons are the most direct and obvious one.
Dutch artist Johannes Hogebrink gives us an example in this short video posted on the Mediamatic website a while ago.
Did you know...
"There are more species of fungi, bacteria, and protozoa in a single scoop of soil than there are species of plants and vertebrate animals in all North America. And of these, fungi are the grand recyclers of our planet, the mycomagicians disassembling large organic molecules into simpler forms, which in turn nourish other members of the ecological community. Fungi are the interface organisms between life and death."
Mycelium Running, How mushrooms Can Help Save the World by Paul Stamets