Psilocybe fimetaria: The cap is acutely umbonate at the center and becomes viscid when moist.
Mower's mushroom: The cap is widely conical or bell-shaped and typically dry.
Psilocybe fimetaria: Typically found on cow or horse manure, particularly in fields used for grazing.
Mower's mushroom: Frequently found in lawns, parks, and pastures.