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fairy ring

fairy ring
A fairy ring is complete circle or arc of fruiting bodies of fungi, particularly agarics, which commonly appear in fields and lawns. Each colony of fungi is derived from a single spore from which the hyphae grow out in all directions forming an invisible circular colony that only becomes visible when fruiting bodies are formed at its periphery. The name is derived from the old superstition that mushrooms growing in a circle represent the path of dancing fairies.

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