Penis envy f17

"Penis Envy f17" most likely refers to a specific genetic generation of Penis Envy (Psilocybe cubensis) mushrooms. In mycology, the "F" denotes a filial generation
Penis Envy naturally drops very few spores, many mycologists and researchers use liquid cultures or isolated spore syringes to preserve the F17 genetics for microscopic research rather than relying on standard spore prints.