Species Involved
There are about 60 mushroom species which can grow in the fairy ring pattern. The best known is the edible Scotch bonnet (Marasmius oreades), commonly known as the fairy ring champignon.
One of the largest rings ever found is in France. Formed by Clitocybe geotropa, it is thought to be about 600 metres (2,000 ft) in diameter and over 700 years old. On the South Downs in southern England, Calocybe gambosa has formed huge fairy rings that also appear to be several hundred years old.
Read more about this topic: Fairy Ring
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