SPECIES ATLAS · PSILOCYBE
Psilocybe samuiensis
Named by Guzmán, Bandala & J.W. Allen, 1993
Psilocybin record: reported (one analysis)- 1993name published
- 1analysis on file
- 0found nothing
- 34world records (GBIF)
- 0Canadian records
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, Bandala and John W. Allen described Psilocybe samuiensis in 1993 in Mycotaxon 46: 156, from a collection Allen made in Thailand in August 1991. Index Fungorum and GBIF accept the name unchanged.
- Named
- Guzmán, Bandala & J.W. Allen, 1993
- Type specimen
- Thailand (Index Fungorum: holotype XAL, Allen, 8 Aug. 1991); Gartz et al. 1994 name Koh Samui. (Index Fungorum record, Psilocybe samuiensis; pin = Wikidata coordinates (Q270375))
- Name record
- Species Fungorum name record
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.
- 1994
Reported High concentrations of psilocybin and psilocin, and small amounts of baeocystin, in wild and cultivated fruit bodies; psilocybin also in cultured mycelium
What the record doesn’t show: Only one chemical study exists, by authors linked to the species description; no modern molecular-checked analysis was found.
Records on file.
GBIF, the global biodiversity database, held 34 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.
Sources
- Species Fungorum name record
- GBIF species record
- GBIF occurrence counts by country
- GBIF Canadian records
- Wikidata, Ko Samui (pin coordinates)
- Gartz, Allen & Merlin 1994, J. Ethnopharmacol. 43: 73-80 (abstract)
- Bradshaw et al. 2022, Appl. Environ. Microbiol. 88(24), Table S1 (literature review of Psilocybe chemistry; full text PMC9764976)
- Index Fungorum record, Psilocybe samuiensis
Compiled from the sources above; last checked .