McKennaii is a Psilocybe cubensis strain named after Terence McKenna, the writer and lecturer, though it has no documented link to him. The name is spelt with the double i of a Latin species epithet, but it is a strain name and not a species. It appeared on the Dutch market in the 2000s and has been sold there ever since; its actual parentage is unclear.
Under the microscope it is a standard cubensis: purple-brown print, subellipsoid spores about 11 to 17 by 7 to 10 micrometres. Growers describing the fruit mention wavy, often uneven caps. McKennaii is sold as multispore syringes and prints, mostly by vendors sourcing from European lines, so the label should give the generation and whether it is an isolate.
Every McKennaii listing above comes from an independent vendor who prepared it, and the vendor's country, shipping regions and real customer reviews are on their store page. Labels tell you what you are getting: a multispore syringe carries many genetic individuals, an isolate (ISO) is a single worked line, and prints and swabs are the dry, long-life formats. Isolated vs multispore syringes explains the difference, how to store spore syringes covers shelf life, and how to use a spore syringe for microscopy walks through the slide. Buying in the UK? Read are mushroom spores legal in the UK. In the United States, see the state by state guide.
Compare this variety with the rest of the cubensis library, browse every spore syringe on the platform, or see all strains.
All Psilocybe and Panaeolus spores on Culture Cave are sold for microscopy and taxonomy use only. Cultivation of controlled species is illegal in most places and is not supported on this platform. Buyers must be 18 or over and are responsible for knowing their local law.