Psilocybe weilii

Psilocybe weilii

Psilocybe weilii is a recently-described species from the State of Georgia in the USA. Locally known before being recognized by science in 1995, this species was frequently mistaken for P. caerulescens var. caerulescens due to their similar appearance. Both share a strong bluing reaction that can leave aged or damaged samples of P. weilii dark blue or even black.

It has preferences for its location, usually restricted to clay-rich soil. P. weilii is commonly found near American Sweetgum (Liquidambar styraciflua) and Loblolly Pine (Pinus taeda); rarely it occurs in Bermuda Grass or Fescue, occasionally in urban lawns or on decaying wood in deep forest. Despite this array, P. weilii is restricted in its natural range to northwestern Georgia.




PSILOCYBE | Psilocybe weilii

This species is considered highly potent, with moderate Psilocybe weilii,

High relative psilocin and trace baeocystin. Hence, it is rarely cultivates due to its slow growth and fickle preference for substrate.

Most accounts of its potency are from wild specimens. Despite we find, P. weilii is  to have a cucumber-like scent and flavour, with generally floury undertones.

Moreover,  Poisonous Mushrooms IN GEORGIA, has a few features that are common among the potent Psilocybe. The edge of the cap is variable: curve in when young, ripple or wavy when middle-age.

Straight and flat when they’re older.Therefore, Spores of this mushroom are dark violet brown, subrhomboid to subellipsoid, and are (5.5)6 to 7(7.5) µm by 5 to 6(6.5) µm. They are thick-walled with broad germ pores.

The few characteristics that set P. weilii apart are the commonly found fringes on their cap. White, fibrous or scale-like, traces can be found on the edge. Further, wooly or hairy patches near the base of the stipe can assist in identifying this species. Rarely grown indoors or cultivated commercially, this find is only likely to occur in its small natural range.

USE OF Psilocybe weilii

Psilocybe weilii is a psilocybin mushroom having psilocybin and/or psilocin as main active compounds.

Originally mistaken for Psilocybe caerulescens var. caerulescens, it is named after Andrew Weil, the integrative medicine physician.


The caps of Psilocybe weilii vary in diameter from (2)3 to 6(8.5) cm and are obtusely conic to convex to. Campanulate, when young the margin is incurve or insert, becoming irregularly lobulate and then straight with age.

Psilocybe weilii, when moist from the separable gelatinous pellicle, is suburbanite, hygrophanous, glabrous, and sub viscid.

Or chestnut brown to dark brown, fading as it dries to buff or straw yellow, with blackish brown remaining at the middle.


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