P.F. stands for Psilocybe Fanaticus also known as Professor Fanaticus, a legendary mycologist that revolutionized the industry and isolated this sub-strain.
Cap: 50-75+ mm in diameter, broadly convex to plane at maturity. Yellowish brown maturing to yellow. Surface dry with small remnants of universal veil on cap (spots). Flesh white soon bruising bluish green.
Stem: 150 mm in length, yellowish, bulbous. Flesh bruising bluish green where injured. Partial veil nearly absent not usually leaving a ring on the stem.
*For microscopy research only and not available in the US states: California, Georgia or Idaho.