Panaeolus semiovatus var. semiovatus, also known as Panaeolus semiovatus and Anellaria separata, and commonly known as the shiny mottlegill, ringed panaeolus, common fungus of the feces variety, or egghead mottlegill, is a medium-sized buff-colored mushroom that grows on horse dung, and has black spores. Though nonpoisonous, it is generally regarded as inedible and possessing a rather abysmal taste, and a few people experience gastric upset after consumption.