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If its what I think it is, when fungi grow many that live in turf areas start as a spot then spread out in a circle. Once they reach their full size (in your case about 10 feet) they set reproductive organs at the end of the hyphae (fungi are composed of filaments called hyphae). These organs remain dormant until the required amount of rain falls. They then start to produce fruiting bodies (mushrooms/toadstools) and release stored Nitrates into the soil, which causes your grass to go green. This is only one of the possible processes depending on the species of fungi. But most of the ones found in this situation produce the same effect. Its the precurser to what is commonly know as "Fairy Rings"
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