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The Shroomverse alien among shaded coffee plantations on a misty Oaxaca mountainside.

SPECIES ATLAS · PSILOCYBE

Psilocybe hoogshagenii

Named by R. Heim, 1959

Psilocybin record: reported (one or older reports)

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.

Roger Heim described Psilocybe hoogshagenii from Oaxaca; Index Fungorum treats a 1958 printing as invalid and dates the valid name to 1959 (Revue de Mycologie 24: 104). Guzmán 1983 placed Heim and Cailleux's P. semperviva in var. convexa, but Index Fungorum still lists P. sempervivae as a separate current name.

Named
R. Heim, 1959
Other names in the records
Psilocybe hoogshagenii var. convexa Guzmán (1983)
Type specimen
Oaxaca, Mexico (Index Fungorum: holotype PC, Cabrero & Hoogshagen, 14 Jul. 1958). (Index Fungorum record, Psilocybe hoogshagenii; pin = Wikidata coordinates (Q34110))
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. 1958

    Reported Psilocybin and psilocin reported for var. convexa, studied as P. semperviva (Heim & Wasson 1958; Heim & Hofmann 1958)

    Method: paper chromatography (per Bradshaw Table S1). Guzmán 1983, The Genus Psilocybe (Beih. Nova Hedwigia 74), Table 11, archive.org scan

  2. 1993

    Reported Psilocybin reported for var. hoogshagenii (Stijve & de Meijer 1993, Brazil); Guzmán 1983 had said this variety was never studied chemically

    Method: HPLC and TLC (per Bradshaw Table S1). Bradshaw et al. 2022, Appl. Environ. Microbiol. 88(24), Table S1 (literature review of Psilocybe chemistry; full text PMC9764976)

What the record doesn’t show: The old reports rely on names now disputed, and no modern molecular-checked analysis was found.

Records on file.

GBIF, the global biodiversity database, held 243 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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