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SPECIES ATLAS · INOSPERMA

Inosperma calamistratum

Named by (Fr.) Matheny & Esteve-Rav., 2019

Psilocybin record: disputed (one old positive report; later analyses negative)

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 calamistratus in 1821 in Systema Mycologicum. Gillet moved it to Inocybe in 1876, and Matheny and Esteve-Raventós moved it to Inosperma in 2019 when they split Inocybe into several genera; chemistry papers use Inocybe calamistrata.

Named
(Fr.) Matheny & Esteve-Rav., 2019
First published as
Agaricus calamistratus Fr. (1821)
Other names in the records
Agaricus calamistratus Fr., Inocybe calamistrata (Fr.) Gillet, Inocybe hirsuta J.E. Lange, Inocybe praetermissa P. Karst.
Type specimen
Not indicated (Index Fungorum: 'Typification: not indicated'); Fries 1821, Systema Mycologicum 1: 256. (Index Fungorum record, Agaricus calamistratus)
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. 1985

    Not detected Psilocybin and other methylated tryptamines absent

    Method: TLC and HPLC. Stijve, Klán & Kuyper 1985, Persoonia 12(4): 469-473 (Naturalis repository, full text)

  2. 1986

    Disputed Psilocybin, psilocin and baeocystin reported by Gartz (Biochem. Physiol. Pflanzen 181: 275-278), cited by Stijve & Kuyper 1988 as a likely false positive

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

  3. 2013

    Not detected Coded as psilocybin-negative by simple majority (Besl & Mack and Stijve et al. negative, Gartz positive)

    Method: review of literature. Kosentka et al. 2013, PLoS One 8: e64646, with Table S1 (full text PMC3662758)

  4. 2022

    Not detected No psilocybin, psilocin or related tryptamines in nine fruiting bodies from five collections

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

What the record doesn’t show: The one positive report has not been repeated and was judged a false positive; every other analysis is negative.

Records on file.

GBIF, the global biodiversity database, held 3,205 occurrence records under this name, 191 of them from Canada, when we checked on October 25, 2026. GBIF lists 191 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 .

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