Psilocybe ovoideocystidiata

Psilocybe ovoideocystidiata is a psilocybin-containing mushroom first documented in Pennsylvania and also known from Michigan, Ohio and West Virginia. This mushroom bruises blue where handled and has been put into the Stuntzii section of Psilocybe because it has subrhomboid thick walled spores and an annulus. It is closely related to to P. subaeruginascens from Java, P. septentrionalis from Japan, and P. wayanadensis from India.

This mushroom was first documented by Richard V. Gaines in Montgomery County in June of 2003 and has become common in the Ohio river valley.

Its range and appearance are similar to Psilocybe caerulipes, and it can be distinguished by its rhomboid spores and membranous annulus.

Some specimens of Psilocybe ovoideocystidiata turn blue immediately when bruised, while others have a delayed or almost absent bluing reaction. The mushroom often turns blue in the absence of bruising as it dries out.

Description
The cap is smooth, convex to subumbonate and up to 4 cm across. It is chestnut brown, olive green, or white and slippery when moist with striations at the edge, fading to buff as it dries and often turning blue. The gills have adnate attachment and range from whitish to rusty brown, lavender, or dark purple brown. The stem is 2 to 7.5 cm long, hollow, smooth at the top and often having small scales near the bottom, colored whitish with irregular yellowish, brownish, or bluish patches. The mushroom quickly (after a few minutes) bruises blue when damaged and has a farinaceous odor.