Extract from Wikipedia article: Panaeolus fimicola is a widespread but seldom identified "little brown mushroom" which sometimes contains small amounts of the hallucinogen psilocybin. Panaeolis ater is a synonym.
Small lawn mushrooms Agrocybe retigera, turf mottlegill (Panaeolus fimicola) and Parasola in Lick Creek Park. College Station, Texas, June 21, 2018 Iron Bridge Trail, College Station, TX 77845, USA
Turf mottlegill (Panaeolus fimicola) and Coprinopsis mushrooms on a lawn in Lick Creek Park. College Station, Texas, September 11, 2018 Lick Creek Park, 13600 Rock Prairie Rd, College Station, TX 77845, USA