"Fairy circles" have occurred in Europe for centuries and centuries and occur there today. Also known as the fairy ring. Made from fairy fungus mycelium with mushrooms (and toadstolls). Also, made from the connetction of oval generts of mushrooms. No termites for the European fairy circles. European fairy rings can be over 33 feet in diameter. One source to read on the subject is
http://en.wikipedia.org/wiki/Fairy_ring