A species of the mottlegill genus (Panaeolus). Probably egghead mottlegill (Panaeolus semiovatus; sometimes in a genus of its own as Anellaria semiovata). Plz see this site: http://www.svims.ca/council/Panaeo.htm Cheers Harri Harmaja http://www.fmnh.helsinki.fi/users/harmaja/index.htm