A global community of nature enthusiasts
photographing and learning about wildlife
Lactarius piperatus
Andres, this is not an Agaricus because if you look at the soil that the mushroom grows on you'll see it's a forest floor. The only species of Agaricus that I know grow in a forest are A. Silvicola and A. Silvaticus (and these look different). Plus A. Arvensis has another type of gills and another color.
And I bet that if you tear the mushroom in the picture, a white milky sap will be visible.