Panaeolus cyanescens, which was previously known as Copelandia cyanescens and commonly referred to as a Cope, Pan cyan or just cyan, is a small mushroom often found growing from dung.
It is known to contain high levels of psilocybian alkaloids, being one of the most potent mushrooms known to man. For this reason it is popular for cultivation.
Cap: 1.5-4 cm broad, bell-shaped to convex; surface smooth or sometimes cracked, not viscid, brown when moist, fading to grayish or whitish as it dries; margin often wavy or split in age. Flesh thin, bruising blue or bluish-green.
Gills: Adnate to adnexed or seceding, gray to black, the faces usually mottled.
Stem: 6-12 cm long, 2-4 mm thick, equal or with a slight bulb at base, usually long and slender, smooth, pallid to yellowish, grayish, or pinkish, the base brownish or tinged flesh-color; bruising bluish at least somewhat when handled.
Spores: Print - Black; spores 12-14 x 8-11 microns, elliptical, smooth.
Habitat: Solitary to widely scattered or in groups on or near dung in pastures; widely distributed in the tropics and subtropics. It is fairly common along the Gulf Coast of the United States and also occurs Mexico, Hawaii, the Philippines, Australia, France, Brazil, and Bolivia.