The cap is similar to that of Agaricus campestris (The Field Mushroom). The gills are white at first (when this fungus is most often confused with deadly Amanita species). They later pass through grey and brown to become dull chocolate. There is a large spreading ring, white above but sometimes with yellowish scales underneath. Viewed from below, on a closed cap specimen, the twin layered ring has a well developed 'cogwheel' pattern around the stipe. This is the lower part of the double ring. The odor is described as like anise. It belongs to a group of Agaricus which tend to stain yellow on bruising.
New Nanotechnology - Nanoparticles Study Findings Have Been Published by Scientists at Konkuk University, Department of Chemical Engineering.
Feb 02, 2011; Scientists discuss in 'Covalent immobilization of [sz]-1,4-glucosidase from Agaricus arvensis onto functionalized silicon oxide...