Psilocybe zapotecorum  Psilocybe zapotecorum is a psilocybin mushroom which has psilocybin and psilocin as main active compounds. It is in the section "Zapotecorum". It is named for the Zapotec Indians, who are native to the Sierra Madre mountains of Oaxaca Mexico, as well as the area they inhabited. According to Richard E. Schultes the Zapotec name translates as "Crown of thorns mushroom". Other sources give the Zapotec name as "badao zoo" translated as ""hongo borracho"", "drunken mushroom". "Psilocybe zapotecorum" has a farinaceous smell and taste. The cap is 2–13 cm, conical to convex, and very rarely expanding to plane in age. The margin wavy sometimes with an acute papilla or mamilla, usually umbonate or with a depressed center. In young specimens the margin has a scalloped edge which sometimes curls upwards as the mushroom matures. The cap is yellowish brown to tan, fading to cream-yellow then brown and finally black through age. The flesh is originally white but soon changes to a cyan blue, then quickly to black. "Psilocybe zapotecorum" gills are a cream color when young and violet brown in age, with an attachment that is sinuate or adnate, and sometimes subdecurrent. The spores are dark violet brown, oblong to subellipsoid to subrhomboid, and thin-walled with a short apiculus and truncate germ pore. They measure (5) 6 - 7 (-8) by (3-) 3.5 - 4.5 (-5) x 3 - 4 µm. The stipe is 3–26 cm long, and 0.5–1 cm thick. It is central, flexuous, cylindric or slightly flattened, and hollow. It can be white to grey, turning yellowish, blue, and black in age. The entire stem is covered with many white scales which are more pronounced in the lower part of the stipe. The partial veil is white and arachnoid, disappearing in age. Often a long pseudorrhiza can be found attached the base of the stipe. Strongly bruising blue then black where damaged. "Psilocybe zapotecorum" grows solitarily or gregariously, sometimes in cespitose clusters of around a hundred mushrooms.