1) Fungus genus 2) Genus stropharia 3) Ring-stalked fungus 
The genus Stropharia (sometimes known by the common name roundheads) is a group of medium to large agarics with a distinct membranous ring on the stipe. Well-known members of this genus include the edible Stropharia rugosoannulata and the blue-green verdigris agarics (Stropharia aeruginosa and allies). Stropharia are not generally regarded as good...
[n] - genus of gill fungi with brown spores that is closely related to Agaricus
genus Stropharia noun genus of gill fungi with brown spores that is closely related to Agaricus; here placed in its own family Strophariaceae