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The feature that seems most similar to the Namibian phenomenon is that the first visible evidence of a new fairy ring is a circle of stimulated grass that develops on the nitrogen released after the fungus breaks down organic matter in the soil. Fairy rings are caused by several soil-inhabiting fungi that feed on organic matter in the soil. These dark green or brown circular rings, a few centimetres to 15 metres in diameter, are caused when a fungus grows outward from a central point. If it meets another ring it stops growing, resulting in a scalloped ring.
A ring of brown or dead grass may also develop due to a dense growth of white mycelium that does not allow water to penetrate. Mushrooms can develop in a circle outside the dark green or brown ring after autumn rain - assuming, of course, that the little folk danced sufficiently well the night before.