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Agaricus bisporus is an edible mushroom in the family Agaricaceae, native to the grasslands in Europe and North America. It is commonly known as button mushroom, common mushroom, table mushroom, white mushroom, portobello mushroom, cremini, crimini mushroom, Swiss brown mushrooms, Roman brown mushrooms, Italian brown, Italian mushroom, and cultivated mushroom. This species is cultivated in more than 70 countries, and is one of the most commonly and widely consumed mushrooms in the world.
A young specimen with a closed cap and either pale white or light brown flesh, is known as button mushroom or white mushroom.
Immature mushroom with darker flesh, and cap begin to open slightly, is called crimini mushroom, baby portobello, baby bella, mini bella, portabellini, Roman mushroom, Italian mushroom, or brown mushroom.
A mature Agaricus bisporus is known as portobello.
Agaricus bisporus is commonly found in fields and grassy areas after rain, from late spring through autumn worldwide.
Agaricus bisporus could be confused with the young specimen of the deadly poisonous Destroying Angel from the genus Amanita. Destroying Angel can be distinguished by their white stalks and gills, and volva (universal veil) at the base of the mushroom. It is important to always clear away debris and examine the base of a mush room, and also cut open young specimen to check the gills.
Agaricus bisporus contain high amount of Vitamin D, especially when UV-irradiated. It also contains sodium, potassium, phosphorus, conjugated linoleic acid and antioxidants. This mushroom also possess possible immune system enhancing properties.