Marasmius oreades is known the world over as the fairy ring mushroom. I have not come upon them in the wild, though they do grow in Australia, having probably been imported from Europe. I came upon them in a market in Perth, where they were being sold for $160 per kilogram, imported from France! The picture below shows what they look like by the time they have been picked, shipped and packed.
In France, these are known as Mousserons.
I will leave the reader to investigate further the identification of these mushrooms. This investigation should be undertaken with care, as there are lots of mushrooms that come up in fairy rings, and some of them are extremely poisonous.
Here is a link describing them in Victoria.
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