Scientific name of White Button Mushroom is

The scientific name of the White Button Mushroom is Agaricus bisporus.
Agaricus bisporus is an edible basidiomycete mushroom native to grasslands in Europe and North America. It is originally a gilled fungus.
It was first described by English botanist Mordecai Cubitt Cooke in his 1871 Handbook of British Fungi, as a variety (var. hortensis) of Agaricus campestris.