“PF Classic” is likely a strain of Psilocybe cubensis, a species of psychedelic mushroom that is commonly grown for its psychoactive compounds. The name “PF” may refer to the original grower or to the growing method used, which could be the “PF Tek” method that involves growing the mushrooms on a substrate of vermiculite and brown rice flour.

Psilocybe cubensis mushrooms have a distinctive appearance, with a reddish-brown cap that often has a central bump, and a slender stem that can be whitish or brownish. They are typically small to medium-sized mushrooms, with caps ranging from 1-8 cm in diameter.