Marasmius oreades

Marasmius oreades, the Scotch bonnet, is also known as the fairy ring mushroom or fairy ring champignon. The latter names tend to cause some confusion, as many other mushrooms grow in fairy rings (such as the edible Agaricus campestris, the poisonous Chlorophyllum molybdites, and many others). Marasmius oreades grows extensively throughout North America and Europe in the summer and autumn (fall) (June - November in the UK), or year-round in warmer climates. It loves grassy areas such as lawns, meadows, and even dunes in coastal areas. Marasmius oreades grows gregariously in troops, arcs, or rings (type II, which causes the grass to grow and become greener). The cap is 1–5 cm across; bell-shaped with a somewhat inrolled margin at first, becoming broadly convex with an even or uplifted margin, but usually retaining a slight central bump- an 'umbo'; dry; smooth; pale tan or buff, occasionally white, or reddish tan; usually changing color markedly as it dries out; the margin sometimes faintly lined.