Probably Aragicus Campestris, which is similar to the common store bought mushroom, though it could be Agaricus Augustus (also known as the "Prince"), one of the finest eating of all wild mushrooms. If it is the Prince, the flesh when crushed should have a distinctive almond or marzipan-like odor. We eat these regularly.

WITH THAT BEING SAID, THERE ARE MANY AGARICUS SPECIES WITH SIMILAR APPEARANCE THAT WILL MAKE YOU SICK. UNLESS YOU HAVE A QUALIFIED FUNGOPHILE IDENTIFY THEM IN HAND, YOU SHOULD NOT EAT THEM.

SIMILAR-LOOKING ARAGICUS SPECIES THAT OCCUR LOCALLY AND ARE POISIONOUS, BUT WITH SUBTLE APPEARANCE DIFFERENCES (INCUDING LACK OF ALMOND ODOR, OR PRESENCE OF A FOUL ODOR OR STAINING OF THE FLESH WHEN BRUISED), INCLUDE Agaricus placomyces, Agaricus praeclaresquamosus, Agaricus xanthodermus, and several others. The results of eating a poisonous variety of Aragicus include sweating, flushing and severe stomach cramps.