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Wiktionary
fairy ring

n. 1 A ring of fungi marking the periphery of the perennial underground growth of the mycelium. 2 (context mythology English) A mythical place where fairies are thought to congregate in a ring.

WordNet
fairy ring

n. a ring of fungi marking the periphery of the perennial underground growth of the mycelium [syn: fairy circle]

Wikipedia
Fairy ring

A fairy ring, also known as fairy circle, elf circle, elf ring or pixie ring, is a naturally occurring ring or arc of mushrooms. The rings may grow to over in diameter, and they become stable over time as the fungus grows and seeks food underground. They are found mainly in forested areas, but also appear in grasslands or rangelands. Fairy rings are detectable by sporocarps in rings or arcs, as well as by a necrotic zone (dead grass), or a ring of dark green grass. Fungus mycelium is present in the ring or arc underneath.

Fairy rings are the subject of much folklore and myth worldwide—particularly in Western Europe. While they are often seen as hazardous or dangerous places, they can sometimes be linked with good fortune.