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Fairy ring
A fairy ring, also known as fairy circle, elf circle, elf ring〔'Chambers's Edinburgh journal, Volume 9'' by William Chambers, Robert Chamber, W. Orr, 1841, Page. 55〕 or pixie ring, is a naturally occurring ring or arc of mushrooms.〔(【引用サイトリンク】website=Australian National Botanic Gardens )〕 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.
==Genesis==
The mycelium of a fungus growing in the ground absorbs nutrients by secretion of enzymes from the tips of the hyphae (threads making up the mycelium).〔 This breaks down larger molecules in the soil into smaller molecules that are then absorbed through the walls of the hyphae near their growing tips.〔 The mycelium will move outward from the center, and when the nutrients in the center are exhausted, the center dies, thereby forming a living ring, from which the fairy ring arises.〔
There are two theories regarding the process involved in creating fairy rings. One states that the fairy ring is begun by a spore from the sporocarpus. The underground presence of the fungus can also cause withering or varying colour or growth of the grass above. The second theory, which is presented in the investigations of Japanese scientists on the ''Tricholoma matsutake'' species, shows that fairy rings could be established by connecting neighbouring oval genets of these mushrooms. If they make an arc or a ring, they continuously grow about the centre of this object.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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