shroomverse
The Shroomverse alien studying a large eighteenth-century French folio of hand-coloured plates in a Paris library.

SPECIES ATLAS · CANDOLLEOMYCES

Candolleomyces candolleanus

Named by (Fr.) D. Wächt. & A. Melzer, 2020

Psilocybin record: disputed

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.

Fries described Agaricus candolleanus in 1818 in Observationes Mycologicae. Maire moved it to Psathyrella in 1937, and Wächter and Melzer to the new genus Candolleomyces in 2020 (Mycological Progress 19: 1233); the chemistry papers use Psathyrella candolleana.

Named
(Fr.) D. Wächt. & A. Melzer, 2020
First published as
Agaricus candolleanus Fr. (1818)
Other names in the records
Agaricus candolleanus Fr., Psathyrella candolleana (Fr.) Maire, Agaricus appendiculatus Bull.
Type specimen
No locality: Index Fungorum gives typification by plates (Bulliard, Herb. Fr. tab. 397; Flora Danica tab. 774). (Index Fungorum record, Agaricus candolleanus)
The record we cite gives no map position for the type specimen. 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. 1986

    Disputed Psilocybin reported by Gartz (as Psathyrella candolleana); a further collection was later found free of it (Gartz, pers. comm., per Stijve & Kuyper 1988)

    Method: TLC (per Stijve & Kuyper 1988). Stijve & Kuyper 1988, Persoonia 13(4): 463-465 (Naturalis repository, full text)

  2. 1988

    Not detected Psilocybin, baeocystin and related tryptamines absent in five collections from Switzerland, Washington DC and Ottawa

    Method: TLC and HPLC (detection limit 0.005% dry weight). Stijve & Kuyper 1988, Persoonia 13(4): 463-465 (Naturalis repository, full text)

What the record doesn’t show: The positive report was not repeated and its primary paper was not opened.

Records on file.

GBIF, the global biodiversity database, held 39,325 occurrence records under this name, 692 of them from Canada, when we checked on October 25, 2026. GBIF lists 692 occurrence records from Canada under this name (checked 2026-10-25); the records are not verified identifications. 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 .

Save to Pinterest