Panaeolus retirugis Fr. Cap 3-6cm across, bell-shaped; pale tan-brown, but often white when old and dry; glabrous, surface often pitted or wrinkled. Gills adnate, crowded, broad; purplish gray at first, then blackish brown. Stem 90-150 x 3-7mm, hollow; whitish to pale gray; densely pruinose for most of its length; beaded above with droplets when fresh. Flesh thin; brown. Odor not distinctive. Taste slightly foul. Spores lemon-shaped, with an apical pore (11)12-16(18) x 8-11µ. Deposit blackish. Habitat on dung or on heavily manured soil. Found in Europe and widespread throughout North America. Season April-August. Not edible.