https://www.alamy.com/in-france-the-often-circular-spot-near-a-tree-oak-in-this-case-where-no-grass-grows-is-called-a-brulle-the-mycelium-of-the-precious-edible-mushroom-growing-in-the-soil-prevents-grass-or-other-plants-from-growing-on-the-surface-therefore-a-brulle-is-indicative-of-places-where-truffles-grow-tuber-melanosporum-belongs-to-the-fairy-ring-forming-mushroom-species-bauduen-france-image455216679.html