Wiktionary
n. ''Agaricus bisporus'', the white or common mushroom.
Usage examples of "button mushroom".
From a small stone charcoal-fed oven the homely mole produced a stew of carrot, turnip, peas and leeks, a large cottage loaf and a button mushroom turnover garnished with parsley.
He spread the chopped button mushroom and grated carrot mixture on its pastry base, making sure it was level.
Large platters of chicken had been served- almond chicken, cashew chicken, button mushroom chicken, and lichee chicken.
Screwing up her eyes each time with the same pained expression she had worn back in Harry's bedroom, her nose swelled to a beak-like protuberance that resembled Snape's, shrank to the size of a button mushroom and then sprouted a great deal of hair from each nostril.
They came anywhere from little squatty fellows no bigger than a button mushroom up to tall, slender stalks, knee high.