Agaricus Arvensis, commonly known as the horse mushroom, is a popular edible mushroom found across Europe and North America. This mushroom belongs to the Agaricus genus, which includes other edible species such as the field mushroom and the portobello mushroom. The horse mushroom is characterized by its large size and creamy white cap with black or brown scales. The synonym for Agaricus Arvensis includes mushroom of the fields and meadows, field mushroom, and Agaric des champs. This versatile mushroom can be eaten raw or cooked and is commonly added to soups, stews, and sauces. So, next time you come across Agaricus Arvensis, remember it by its popular synonym the horse mushroom.