I'm afraid no-one will stick their neck out and give you a positive identification of a mushroom from one photo, especially one that doesn't show the base of the stem. Get a good guide, and look at the whole mushroom as it grows, and you might be able to tell. Even then, that sort (like normal mushrooms) are some of the hardest to identify correctly: there are a lot of species that look kind-of like that and many are poisonous.