The McKennaii mushrooms spores are a strange strain of the psilocybe cubensis. It's origin is unknow but the name is definitely a tribute to honor the psychonaut Terence McKenna. The Mckennaii strain grows it's mushrooms in different sizes and cap shapes changes unlike any other cubensis. It is a good and fast grower on BRF substrate. And possibly one of the stronger P. cubensis strains available. To explore the diversity of the cubensis mushroom the Mckennaii strain is the best choice.