McKennaii is a particularly potent strain of Psilocybe cubensis magic mushrooms, widely known for its strong visual effects and distinct dark caps. It was developed in the Netherlands and named as a tribute to the legendary ethnobotanist and psychedelic advocate Terence McKenna.
It is considered above average in psilocybin and psilocin content, which can cause intense visual distortions and deep philosophical introspection even at moderate doses.