Which mushroom produces rings sometimes called “fairy rings”?

Fly Agaric

The Fly Agaric is famous not only for its vivid colors and iconic appearance but also for its ability to form "fairy rings" in nature. These rings form as the mushroom's mycelium spreads underground, radiating out from a central point. As it grows, mushrooms emerge in a circle at the surface, creating a mysterious ring that can persist for years. In European folklore, these rings were often associated with fairy dances or witch gatherings, wrapping the fly agaric in an aura of mystery and magic. Despite its beauty, it's important to remember that the fly agaric is highly toxic and should never be consumed.