Portobello
Button
Button mushroom is the least mature stage of the Portobello mushroom, with a small, white cap and a short stem.
Cremini
Cremini mushroom is the intermediate stage of the Portobello mushroom, with a larger, brown cap and a longer stem.
Portobello
Portobello mushroom is the most mature stage of this mushroom, with a large, dark brown cap and a thick, white stem.