Before it got officially described in 2012, this highly potent Cubensis strain had been known for many years growing naturally around the Bay Area. At the time, it was referred to by the mushroom community as Psilocybe cyanofriscosa.The provisional name not being grammatically correct Latin, scientist renamed it in honour or famous ethno-mycologist J.W. Allen. Scientists said it was his enthusiasm, his persistence and his deep belief in this new specie, that motivated the detailed study and DNA sequencing that occurred. So Psilocybe allenii became.
Both the morphological and molecular features of P. alennii indicate its close relationship to Psilocybe cyanescens, so much that even Psilocybe experts such as Guzman confused them; others even suspect it was wrongly featured in some photographs under the name of its dopplegänger. To help differentiate the both, we note that P. allenii rarely has a wavy cap like P.cyanescens, and is overall more slender, sightly darker and not as common in coastal dune grasses. This cold-resistant strain, like many Cubensis, is a relatively easy grower and a generous fruiter, thus making it popular for indoor cultivation.
When Allen picked his first P. alennii in 1982 in Capitol Hill (Washington DC), little did he know that 30 years later, this specie would bear his name.