Looks like Marasmius oreades - "the Fairy Ring Mushroom".
Also has deadly lookalikes in the genus Clitocybe.
Do not pick any mushrooms without taking someone experienced with you.
Mushroom poisoning is no joke! CEVISI, if you are asking this question about a specimen that bears only a slight resemblance to liberty caps it seems you need to study up considerably more before ingesting any mushroom you picked (Well, at least you asked first...)
“There is a way of manipulating matter and energy so as to produce what modern scientists call 'a field of force'. The field acts on the observer and puts him in a privileged position vis-à-vis the universe. From this position he has access to the realities which are ordinarily hidden from us by time and space, matter and energy. This is what we call the Great Work."
― Jacques Bergier, quoting Fulcanelli