all mushrooms are edible — but alas ... some only once
Canon EOS 6D - f/5.6 - 1/100sec - 100mm - ISO 8000
Measures of the bigger slice: b x h = 3.5 x 3 cm
Agaricus bisporus is an edible 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. When mature, it is known as portobello mushroom, often shortened to just portobello.
When immature and white, this mushroom may be known as common mushroom, button mushroom, white mushroom, cultivated mushroom, table mushroom, and champignon mushroom.
A. bisporus is one of the most commonly and widely consumed mushrooms in the world.
Today's commercial variety of the common mushroom originally was a light brown color. In 1926, a Pennsylvania mushroom farmer found a clump of common mushrooms with white caps in his mushroom bed. As with the reception of white bread, it was seen as a more attractive food item and became very popular. Most of the cream-colored store mushrooms marketed today are products of this 1926 chance natural mutation.