Agaricus bitorquis (Quél.) Sacc. (1887)

This is one of the classic Agaricus species, widely available in Suburbia. It can easily be distinguished by its sheeting annulus and typically squat stature when growing in very packed surfaces. When fruiting in softer substrates it tends to develop a leggier stature with the annulus remaining at the lower part of the stem. Another distinctive feature is the double annulus that is present in some fruitbodies. This is the reason why the members of this Section are called Duploannulati.

The distinctive double annulus