Psilocybe Cubensis grows all over the South on cow pies after some rain mellows them out. But beware picking just any old mushroom growing on a cow pie! You need an experienced mushroomer with you so you don't die if you go hunting. Totally impossible to eradicate, ever.
Fantastic Fungi on Netflix is very nice: I went to High School with the producer/cinematographer. The first half is naturalist footage. The second is very much psychedelic!
>8 times: Yeah, that's about right. That's when God tells you you don't need to drop acid any more.