High Quality Content by WIKIPEDIA articles! Psilocybe hispanica is a species of fungus in the Strophariaceae family. It produces small brown mushrooms with conical to convex caps up to 10 mm (0.4 in) in diameter and stems 16 to 25 mm (0.6 to 1.0 in) long by 0.5 to 1 mm (0.02 to 0.04 in) thick. Reported as new to science in 2000, it is only known from the Pyrenees mountain range in northern Spain and southwestern France, where it grows on horse dung in grass fields at elevations of 1,700 to 2,300 m (5,600 to 7,500 ft). The mushroom contains the psychoactive compound psilocybin. The possible depiction of this species in the 6,000-year-old Selva Pascuala rock art suggests that it might have been used in ancient religious rituals—the oldest evidence of such usage in prehistoric Europe.