Agaricus bisporus is an edible basidiomycete mushroom native to grasslands in Europe and North America. It has two color states while immature – white and brown – both of which have various names, with additional names for the mature state. White button mushrooms are small to medium in size with caps averaging 2-7 centimeters in diameter and are attached to short, truncated stems. The smooth white caps are rounded, firm, and spongy. When bruised, the white flesh will turn light pink and will then transform into brown. They also contain B vitamins as well as a powerful antioxidant called selenium, which helps to support the immune system and prevent damage to cells and tissues. In particular, white button mushrooms are one of the few non-animal sources of vitamin D. White button are the most common and least expensive mushrooms to appear on grocery store shelves. They have a mild taste and can be used in just about anything from salads to sauces. Button mushroom flavor intensifies when cooked, making them ideal for sautéing and grilling.