In Aalborg I learned about the witch rings. This fascinating phenomenon is associated with a great mystery and has given rise to many forms of superstition, especially about the dance of supernatural beings. Actually, witch rings are caused by the mycelium of the fungus, that is, the underground part of the fungus. The mycelium of some mushroom species extends from the center like a circle, so they form a nice ring in the soil. #nature#fungi#aalborg#denmark#memories