What distinctive formation is associated with the fairy ring phenomenon?

The fairy ring phenomenon is characterized by mushrooms that grow in a circular formation, which is why the answer refers to mushrooms growing in a circle. This unique pattern occurs due to the growth and expansion of fungal mycelium underground. As the mycelium spreads outward from a central point, the nutrients in the soil become depleted, leading to mushrooms sprouting in a ring as they strive for resources. This creates the distinctive circular formation associated with fairy rings, often observed in grassy areas. The circle may expand over time, forming larger rings, and sometimes the grass inside the ring may appear greener and taller due to the organic matter produced by the mushrooms.