B+ is a strain of Psilocybe cubensis, a well-known hallucinogenic mushroom species[i]. The B+ strain is popular with growers because it is easy to work with, accepting a very wide range of growing conditions and substrates and producing large, thick caps. Though not the fastest-grower among P. cubensis strains, B+ is not the slowest, either. Color can vary a little, depending on growing conditions; enthusiasts describe the large golden to caramel-color caps as “beautiful.”