Psilocybe ovoideocystidiata is a psilocybin mushroom in the section Stuntzae, having psilocybin and/or psilocin as main active compounds. It is closely related to P. subaeruginascens from Indonesia, P. septentrionalis from Japan, and P. wayanadensis from India. This mushroom was first documented by Richard V. Gaines in Montgomery County in June 2003. Although it is sometimes confused with Psilocybe caerulipes, it can be distinguished by its rhomboid spores, larger stature, earlier fruiting season and membranous annulus.


From the frequent ovoid both pleuro- and cheilocystidia.


  • Cap: 1 — 4.5 cm across, convex to subumbonate, chestnut or orangish brown to yellowish brown, hygrophanous, glabrous, sub-viscid, translucent-striate near the margin, from slightly to highly undulated in maturity, with irregular yellowish, brownish, or bluish tones, sometimes white when dry. Flesh thick, pliant. Bruises blue where injured.
  • Gills: adnate attachment and range from whitish to rusty brown, lavender, or dark purple brown.
  • Spores: Dark purple brown, rhomboid to subrhomboid in face view, subellipsoid in side view, thick-walled, 8 x 6 µm .
  • Stipe: 1.5 – 9 cm by 1 – 7 mm, equal, somewhat subbulbous, hollow, base sometimes hypogeous, smooth at the top and often having small scales near the bottom, colored whitish with irregular yellowish, brownish, or bluish tones. The partial veil is variable, ranging from a thin cortina that leaves a barely perceptible annular zone, to a substantial membrane that leaves a fairly persistent annulus.
  • Taste: farinaceous
  • Odor: farinaceous
  • Microscopic features: Two types of cheilocystidia and pleurocystidia are present.

Habitat and formation

Psilocybe ovoideocystidiata is common in the Ohio river valley. Often found in the woody debris of overflow areas, along rivers and streams, rarely in man-made mulch. They are most common from April to mid June but they occasionally fruit as late as November. It was first documented in Pennsylvania and also known from Ohio and West Virginia and most recently from New Jersey.


  • Guzmán G, Gaines RV, Ramirez-Guillen F. (2007). New species of hallucinogenic Psilocybe from the eastern U.S.A. International Journal of Medicinal Mushrooms 9(1): 75–77 (2007)
This page uses content from the English Wikipedia. The original article was at Psilocybe ovoideocystidiata. The list of authors can be seen in the page history.

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