We all know, I hope, the danger of eating wild fungi without adequate knowledge of exactly what one is picking and if that does need re-emphasing here is a species designed to do just that! Fools funnel (Clitocybe rivulosa) is deadly poisonous and is best not even touched let alone eaten. It looks like fairy ring champignon which is considered a delicacy in France, it grows in rings like champignon and grows in similar places so you can see the difficulty.
The fools funnel grows among short grass on lawns, parks and pasture in small groups but, more often, in rings. It is widespread and common in autumn.