Fairy rings made by fungi like Marasmius oreades are called "free" rings. They will continue to grow outward until a barrier is reached. Sometimes the barrier is another fairy ring! Rings can grow into each other's territory and die as each reaches the other's "dead zone."
herbarium.usu.edu/fungi/funfacts/ringsfct.htm herbarium.usu.edu/fungi/funfacts/ringsfct.htm
Fairy rings appear in any lawn, golf course or other turf areas during spring and summer months. Centuries ago people thought that the mushrooms appeared where "fairies" had danced the night before-hence, the name, fairy ring. Disease Cycle. The disease is caused by any one of a number of soil-inhabiting fungi.
aggie-horticulture.tamu.edu/plantanswers/turf/publicati... aggie-horticulture.tamu.edu/plantanswers/turf/publications/fairyrings.html
The application of fungicides is not a recommended control option provided by turf pathologists The use of pesticides may increase the incidence of fairy rings by destroying saprophytic bacteria and fungi which compete with the fairy ring fungi.
www.coopext.colostate.edu/TRA/PLANTS/fairing.html www.coopext.colostate.edu/TRA/PLANTS/fairing.html
Fairy rings are produced by colonies of mushroom fungi that live in soil and thatch. These colonies obtain food from decaying organic matter and grow outward radially, increasing in size year after year.
turfgrassmanagement.psu.edu/turfdis4.cfm
Q: What causes "Fairy Rings"? In our yard are several rings where the grass has died in an almost perfect circle. The Agriculture Extension Agent sent a brochure naming them as "fairy rings" but short on why they formed and how to get rid of them.
www.wonderquest.com/fairy-ring.htm www.wonderquest.com/fairy-ring.htm
Fairy ring fungi live on dead organic matter in the soil and thatch layer. Fairy rings expand radially outward until the food supply is used up, the soil becomes too wet, or better-adapted organisms surpass the ability of the fungi to survive.
www.extension.umn.edu/yardandgarden/ygbriefs/p316fairyr... www.extension.umn.edu/yardandgarden/ygbriefs/p316fairyrings.html
FairyRingsLawns (PDF File)
1). Figure 1. Dead rings of turf. (Photo courtesy of; Bill Carlos); How Fairy Ring Begins; Over 50 species of the ring fungi have been identified. The most common type of fairy ring is the genus and species Marasmius oreades.
agri.nv.gov/PLANT_PATHOLOGY/2006/FairyRingsLawns.pdf agri.nv.gov/PLANT_PATHOLOGY/2006/FairyRingsLawns.pdf
The fungi use this material as a source of nutrition. The mushrooms, which can be different varieties, are the fruiting stages of these fungi. The fairy ring above is populated by the Chlorophyllum molybdites fungi commonly known as the Green-Spored Parasol mushroom or Green Gill mushroom. ... Eradication of Fairy Rings...
www.floridagardener.com/misc/Fairyrings.htm www.floridagardener.com/misc/Fairyrings.htm
The Mythology of Fungi ... Interesting and amusing stories surround many species of fungi. "Fairy Rings" are the familiar narrow rings of bare ground, of almost any size, found in fields and lawns. They were traditionally thought to be made by fairies dancing in circles on midsummer night’s eve.
fungus.org.uk/nwfg/funmay98.htm fungus.org.uk/nwfg/funmay98.htm
Fairy rings appear rather suddenly, so stories were made up to explain these mysterious and fascinating rings. In countries other than England, they were thought to be made by such forces as lightning, meteorites, witches, sorcerers, and the devil. ... Mushrooms are Fungi...
grandpacliff.com/Fungi/FairyRings.htm grandpacliff.com/Fungi/FairyRings.htm