English to Italian Science Botany Standard per manti erbosi, malattie fungine, cerchi delle streghe

"Fairy rings are common in amenity grassland.
They can be seen as either complete circles, ribbons or arcs of stimulated grass growth which may or may not be associated with bare areas of turf or fruiting bodies.
There are numerous fungi which have been recorded causing fairy rings and the development of the rings is similar, irrespective of the causal organism."
Salve, ho difficoltà a rendere questa espressione e poi non sono sicuro a cosa si riferisca quel which (agli archi o a grass growth?). Grazie a tutti in anticipo per i suggerimenti. Cerco le soluzioni migliori.