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Psilocybia / The Index / Species record

The Psilocybe Index / Species account

Psilocybe yungensis

Singer & A.H. Sm.

Taxonomy: acceptedChemistry: Not yet researchedMolecular data: Agent source-checked

Selected scientific passages checked by Codex; no human review. Comprehensive literature synthesis, conservation research, imagery and occurrence datasets remain incomplete. Chemistry research is incomplete; no absence of compounds or assays is inferred.

01Overview

Agent source-checked

This account connects a type-based revision with a documented Mexican sequence collection. It adopts two synonyms supported by the 2013 revision and preserves the distinction between observations of type material and other specimens. Chemistry and conservation research remain incomplete. [ramirez-cruz-2013-types] [ramirez-cruz-2013-phylogeny]

This is a scientific reference record, not field-identification guidance.

02Nomenclature

Accepted name
Psilocybe yungensis
Authority
Singer & A.H. Sm.
Family
Agrocybaceae
Publication year
1958
Basionym
Not yet researched — verification required
Taxonomic status
accepted
MycoBank identifier
Not yet researched — verification required
Index Fungorum identifier
Not yet researched — verification required
Synonyms (2 recorded names)
  • Psilocybe chiapanensis
  • Psilocybe subyungensis

Nomenclatural sources: [species-fungorum-313043-2026] [niskanen-2026] [ramirez-cruz-2013-types] [ramirez-cruz-2013-phylogeny]

Research completeness

taxonomy
Agent source-checked — Codex (agent), 2026-09-12

Name and two adopted synonyms checked against the primary type revision and current database treatment. Additional listed synonyms, including isauroi/isauri, acutissima and var. diconica, await separate reconciliation and are not adopted here.

overview
preliminary

Selected passages checked; comprehensive coverage remains pending.

description
preliminary

Selected passages checked; comprehensive coverage remains pending.

ecology
preliminary

Selected passages checked; comprehensive coverage remains pending.

distribution
preliminary

Selected passages checked; comprehensive coverage remains pending.

chemistry
not researched

Discovery found a historical paper discussing earlier yungensis non-detection; the original experiment and modern assay coverage have not been checked. Keep not-researched, not none-located.

molecular
preliminary

Selected passages checked; comprehensive coverage remains pending.

history
preliminary

Selected passages checked; comprehensive coverage remains pending.

conservation
not researched

Research incomplete; no absence claim or threat category inferred.

03Taxonomic description

Taxonomic description. These characters are presented for scientific reference and are not intended as field-identification guidance.

Macroscopic characters

Agent source-checked

The 2013 revision describes conical to bell-shaped caps, often with a pronounced central projection, and very narrow gills in its comparison of P. yungensis with P. chiapanensis and P. subyungensis. This is a selected taxonomic description, not a complete account of macroscopic variation. [ramirez-cruz-2013-types]

Microscopic characters

Agent source-checked

The type study describes spores as rhomboid to subrhomboid in frontal view and broadly ellipsoid to ellipsoid in side view. It records variable, sometimes branched cheilocystidia. Caulocystidia occurred in several additional specimens but were not observed in the type specimen; this distinction is retained rather than generalized to all material. [ramirez-cruz-2013-types]

04Distribution and ecology

Agent source-checked

The 2013 revision examined Singer B-648 from Nor-Yungas, Bolivia, collected 28 January 1956, and multiple Mexican collections. These are documented localities in the study, not a complete range assessment. The Mexican Cortés-Pérez 549 collection also appears in the molecular study. [ramirez-cruz-2013-types] [ramirez-cruz-2013-phylogeny]

Known range
Not yet researched
Habitats
Not yet researched
Substrates
Not yet researched
Ecological associations
Not yet researched
Seasonality
Not yet researched

Ecological context

Agent source-checked

The examined Bolivian collection Singer B-648 was recorded on heavily decayed woody material among mosses and liverworts in shade. This specimen-level observation supports a wood-associated habitat record, without establishing the full ecological niche. [ramirez-cruz-2013-types]

Occurrence records

Occurrence map — awaiting verified records

No occurrence points loaded.

Recorded observations are not equivalent to true biological range. Absence of records does not demonstrate absence of a species.

Occurrence provenance & future map methods
Source
Not yet supplied
Licence / retrieval date
Awaiting licence / Not retrieved
Coordinate uncertainty
Not reviewed
Sensitive records
unreviewed

Future ingestion will review licensing, coordinate uncertainty and sensitive locations. Sampling, clustering and date filters will operate on separately loaded datasets; no coordinates are embedded in this page.

05Chemistry

Measurements belong to studies, specimens and methods. A single concentration cannot stand in for a species.

Published assays · Measurements retain their original methodological context.
Study / yearMaterialMethodRecord
No verified assay records entered. This does not establish that no published assays exist.
Fields retained in each future assay record

Study, publication year, specimen, material, sample size, provenance, analytical method, preparation, storage, psilocybin, psilocin, baeocystin, norbaeocystin, aeruginascin, units, qualifiers and methodological notes. No concentrations have been invented for this prototype.

Modern quantitative assays

Not yet researched

Modern quantitative-assay coverage remains to be researched.

Evidence assessment

Not yet researched

Chemical literature has not yet been comprehensively checked for this account; no assay is extracted and no compound absence is inferred.

Assessments depend on material, preparation, storage, sampling and analytical methods. Measurements are literature records, not predictions of effects.

How chemistry records are structured ↗

06Molecular evidence

Agent source-checked

The 2013 multigene study lists Ps-455, A. Cortés-Pérez 549 (XAL), from Mexico, with ITS KC669301, LSU KC669330 and rpb1 KC669364. It places P. yungensis in its cordisporae subclade. The published sequences and placement are reported here without reanalysis. [ramirez-cruz-2013-phylogeny]

07History

Agent source-checked

Singer and A. H. Smith published the name in Mycologia 50(1):142 in 1958. The 2013 revision broadened its documented morphological variation and supported synonymy of P. chiapanensis and P. subyungensis. The original 1958 protologue has not been inspected for this account. [species-fungorum-313043-2026] [ramirez-cruz-2013-types]

A place for the historical record

This account records the nomenclatural history checked so far. Broader historical research remains pending; interpretations must stay connected to their documentary sources.

Reading the scientific record ↗

08Conservation

Not yet researched

Conservation assessments have not yet been checked for this account.

Assessment status
Not yet researched
Assessment authority / year
Not verified / Not verified

Not researched by Psilocybia, not assessed by a conservation authority, and Least Concern are different states. None should be inferred from another.

09Images & specimens

No verified, licensed scientific images supplied

Space is reserved for field photographs, herbarium specimens, microscopy and historical plates, with source and licence metadata.

Photographs are not presented as sufficient for mushroom identification.

10References

  1. T. Niskanen; B. Dentinger; A.M. Ainsworth; I. Kytövuori; J.T. Kim; G.W. Griffith; K. Liimatainen (2026). Re-shaping the family-level classification of Agaricineae (Agaricales, Basidiomycota) using a phylogenomic approach. Studies in Mycology 113(1), 115–134. DOI: 10.3114/sim.2026.113.03 Source record ↗

    Source class: primary.

    Source verification history
    • metadata: verified · 2026-09-10 · Codex (agent) (agent). Verification source

      Bibliographic identity inspected; publication year is distinct from retrieval date.

    • content: verified · 2026-09-10 · Codex (agent) (agent). Verification source

      Family treatment Agrocybaceae, Table 1 and classification discussion inspected in the PDF. Effective online date in paper: 1 April 2026; Crossref issue date differs, so the record retains year only.

    • doi: verified · 2026-09-10 · Codex (agent) (agent). Verification source

      DOI and title matched against the cited bibliographic record; not just resolver availability.

  2. Virginia Ramírez-Cruz; Gaston Guzmán; Laura Guzmán-Dávalos (2013). Type studies of Psilocybe sensu lato (Strophariaceae, Agaricales). Sydowia 65(2), 277–319. Source record ↗

    Source class: primary.

    Source verification history
    • metadata: verified · 2026-09-10 · Codex (agent) (agent). Verification source

      Bibliographic identity checked against the publication.

    • content: verified · 2026-09-10 · Codex (agent) (agent). Verification source

      Full PDF inspected, with goniospora pp. 291–292 and ovoideocystidiata pp. 302–303 read in detail. No numeric microdimensions transcribed because extracted unit glyphs are unreliable. Qualitative cystidial observations and the type voucher are used.

  3. Virginia Ramírez-Cruz; Gastón Guzmán; Alma Rosa Villalobos-Arámbula; Aarón Rodríguez; P. Brandon Matheny; Marisol Sánchez-García; Laura Guzmán-Dávalos (2013). Phylogenetic inference and trait evolution of the psychedelic mushroom genus Psilocybe sensu lato (Agaricales). Botany 91(9), 573-591. DOI: 10.1139/cjb-2013-0070 Source record ↗

    Source class: primary.

    Source verification history
    • metadata: verified · 2026-09-11 · Codex (agent) (agent). Verification source

      Authors, Botany 91(9):573–591, year 2013 and DOI match the primary PDF and Crossref.

    • content: verified · 2026-09-11 · Codex (agent) (agent). Verification source

      Read Table 2 entries Ps-329, Ps-308 and Ps-317, Fig. 1 and the mexicanae/zapotecorum clade discussion. Marker accessions are reported from the paper; no sequence reanalysis.

    • doi: verified · 2026-09-11 · Codex (agent) (agent). Verification source

      DOI, authors, journal and pagination cross-checked against the paper and Crossref.

  4. Species Fungorum (2026). Species Fungorum: Psilocybe yungensis, record 313043 — accessed 12 September 2026. . Source record ↗

    Source class: taxonomic database.

    Source verification history
    • metadata: verified · 2026-09-12 · Codex (agent) (agent). Verification source

      Read name/title, authorship, date and record identity; access year is not nomenclatural publication year.

    • content: verified · 2026-09-12 · Codex (agent) (agent). Verification source

      Current name, authority, 1958 citation and listed synonyms inspected. Adopt only chiapanensis and subyungensis here, supported by the primary type revision. Index Fungorum name-page retrieval failed; no separate registration identifier is populated.

Claim provenance

Source checks record what was inspected. Publication approval and section review are separate editorial decisions.

Name, authority and publication year follow the checked Species Fungorum record and agree with the 2013 type revision.

Fields: taxonomy.canonical_name, taxonomy.accepted_name, taxonomy.genus, taxonomy.specific_epithet, taxonomy.authority, taxonomy.publication_year

The account follows the 2026 placement of Psilocybe in Agrocybaceae.

Fields: taxonomy.family

Retain P. yungensis following the 2013 type revision and Species Fungorum. Adopt P. chiapanensis and P. subyungensis as synonyms, following examination of their types in the revision. This is a scoped synonym list.

Fields: taxonomy.status, taxonomy.synonyms

This account connects a type-based revision with a documented Mexican sequence collection. It adopts two synonyms supported by the 2013 revision and preserves the distinction between observations of type material and other specimens. Chemistry and conservation research remain incomplete.

Fields: overview.text

The 2013 revision describes conical to bell-shaped caps, often with a pronounced central projection, and very narrow gills in its comparison of P. yungensis with P. chiapanensis and P. subyungensis. This is a selected taxonomic description, not a complete account of macroscopic variation.

Fields: description.macroscopic.text

The type study describes spores as rhomboid to subrhomboid in frontal view and broadly ellipsoid to ellipsoid in side view. It records variable, sometimes branched cheilocystidia. Caulocystidia occurred in several additional specimens but were not observed in the type specimen; this distinction is retained rather than generalized to all material.

Fields: description.microscopic.text

The examined Bolivian collection Singer B-648 was recorded on heavily decayed woody material among mosses and liverworts in shade. This specimen-level observation supports a wood-associated habitat record, without establishing the full ecological niche.

Fields: ecology.narrative.text

The 2013 revision examined Singer B-648 from Nor-Yungas, Bolivia, collected 28 January 1956, and multiple Mexican collections. These are documented localities in the study, not a complete range assessment. The Mexican Cortés-Pérez 549 collection also appears in the molecular study.

Fields: distribution.narrative.text

The 2013 multigene study lists Ps-455, A. Cortés-Pérez 549 (XAL), from Mexico, with ITS KC669301, LSU KC669330 and rpb1 KC669364. It places P. yungensis in its cordisporae subclade. The published sequences and placement are reported here without reanalysis.

Fields: molecular.text

Singer and A. H. Smith published the name in Mycologia 50(1):142 in 1958. The 2013 revision broadened its documented morphological variation and supported synonymy of P. chiapanensis and P. subyungensis. The original 1958 protologue has not been inspected for this account.

Fields: history.text