Ahhh the B+ magic mushroom, a best seller at The Magic Mushroom Shop and a big favorite among mycologists, beginners and first time trippers. Lets take a closer look at this popular cubensis strain, known for it’s richness and solid performance. The B+ magic mushroom is a Psilocybe cubensis, a species of psychedelic mushroom. It’s main active elements are psilocybin and psilocin. The p. cubensis species is the most known psilocybin mushroom. Their status is established because p. cubensis are widely distributed and very easy to cultivate.