Ok my favorite subject. There are 180 diiferent types of Psilocybin mushrooms. Not all are active. Depending on the area you live in you can either hunt em or buy em, and of course grow em. Potency of the shroom depend on when it was picked, what type of shroom it is and how it is prepared. For instance the shrooms i picked on Friday are Psilocybe Cyanofibrillosa they are a potent species when fresh due to high levels of psilocin and lower levels of pilocybin, (the ratios on most other mushrooms are reversed Ie high psilocybin low Because of the high levels of psilocin when dried they lose most of their potency because psilocin degrades in the drying process. Psilocybe Cubensis is the most widely cultvated Psilocybin mushroom because of its ease of growing and moderate levels of Psilocybin and Psilocin that are about equal. The best drying method i have used would be about two days in front of a fan and a day in a box with silica gell wwhich will suck all remaining water weight out of them.