shroomverse
The Shroomverse alien beside a creek in a green Appalachian valley in Pennsylvania in spring.

SPECIES ATLAS · PSILOCYBE

Psilocybe ovoideocystidiata

Named by Guzmán & Gaines, 2007

Psilocybin record: confirmed (one modern analysis, plus an earlier report outside peer review)

A history of a name and a chemistry record, not an identification guide. No name, picture or description can show that a wild mushroom is safe, and poisonous mushrooms are mistaken for magic mushrooms. If someone may have eaten a wild mushroom, call a poison centre without waiting for symptoms: 1-844-POISON-X in most of Canada, 1-800-463-5060 in Quebec. Call 911 if they’re unconscious, not breathing or having a seizure.

How it was named.

Guzmán and Gaines described Psilocybe ovoideocystidiata in 2007 in the International Journal of Medicinal Mushrooms 9(1): 75, from a Pennsylvania collection (Gaines 51b) now held at XAL. Index Fungorum and GBIF both accept the original name, with no synonyms.

Named
Guzmán & Gaines, 2007
Type specimen
Pennsylvania, USA (Index Fungorum: holotype XAL, Gaines 51b). (Index Fungorum record, Psilocybe ovoideocystidiata; pin = Wikidata coordinates (Q1400))
The pin marks the type locality at the level of detail the record gives: one historical collection, not a range or a place to look. Land outlines: Natural Earth.

The psilocybin record.

Every analysis we could verify, oldest first, including results that found nothing. No amounts are given: they vary between collections and this is not a potency guide.

  1. 2009

    Reported Psilocybin and psilocin reported by Allen, Gartz & Molter in the Ethnomycological Journals; listed in Bradshaw et al. 2022 Table S1, which notes the paper did not appear in a peer-reviewed journal

    Method: not stated in the review. Bradshaw et al. 2022, Appl. Environ. Microbiol. 88(24), Table S1 (literature review of Psilocybe chemistry; full text PMC9764976)

  2. 2022

    Confirmed Psilocybin, psilocin, baeocystin, norbaeocystin and aeruginascin quantified in eight fruiting bodies from three collections

    Method: UHPLC-MS/MS. Gotvaldová et al. 2022, Int. J. Mol. Sci. 23: 14068 (full text PMC9693126)

What the record doesn’t show: Only one peer-reviewed chemical study exists, covering three collections; the earlier 2009 report was not peer reviewed.

Records on file.

GBIF, the global biodiversity database, held 2,358 occurrence records under this name, 0 of them from Canada, when we checked on October 25, 2026. Records include unverified observations and old misidentifications, so counts show where people have recorded the name, not where it grows.

See the name on GBIF

Sources

Compiled from the sources above; last checked .

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