Panaeolus cyanescens: the Copelandia name and what “Blue Meanies” does not settle

Older papers call it Copelandia cyanescens. Newer ones call it Panaeolus cyanescens. Online it is often just “Blue Meanies”. Another unrelated species, Psilocybe cyanescens, shares the second word. This guide sorts out which name is which, what the databases say about the Copelandia question, and why a name by itself never tells you what a sample is. It is about names and records, not identification.

What is Panaeolus cyanescens?

It is a species name in the genus Panaeolus. Species Fungorum, which mirrors the Index Fungorum database kept at the Royal Botanic Gardens, Kew, gives the current name as Panaeolus cyanescens Sacc., published in Sylloge Fungorum 5: 1123 (1887), in the family Galeropsidaceae. The same record lists two synonyms: Agaricus cyanescens Berk. & Broome (1871) and Copelandia cyanescens (Sacc.) Singer, published in Lilloa 22: 473 (1951) (Species Fungorum, Panaeolus cyanescens). The Copelandia record itself names the 1887 Panaeolus name as its basionym, the earlier name it was built from (Species Fungorum, Copelandia cyanescens).

Other sources agree on the species name. GBIF shows it as an accepted species published in Sylloge Fungorum in 1887 (GBIF), a 2023 review of the genus lists it among the currently accepted Panaeolus species (Strauss et al., 2023), and Wikidata holds an entry for it (Wikidata). Higher classification varies. Species Fungorum and the 2023 and 2026 papers use Galeropsidaceae, while GBIF files the species under Bolbitiaceae (GBIF). Genus and species names are what the sources agree on, so this page leans on those.

Why do older sources say Copelandia cyanescens?

Because for much of the twentieth century some authors treated Copelandia as a separate group from Panaeolus. A 2026 revision recounts that four subgenera of Panaeolus in the broad sense were traditionally recognised, among them subgenus Copelandia (proposed by Bresadola in 1913), and that the non-nominate subgenera were often raised to genus rank (He et al., 2026). Someone using that view would write Copelandia cyanescens, and Species Fungorum records exactly that combination (Singer, 1951).

The registry’s synonymy lets a reader connect the old and new names. It does not mean every paper that used either name had identified its material correctly. A 2023 review warns that misidentification may be the largest problem behind confusion in published chemical studies of psychoactive fungi (Strauss et al., 2023). When you cite an older paper, keep the name its authors used and explain the current treatment separately. Quietly swapping the wording hides a clue about the paper’s taxonomic context.

Is Copelandia still a valid genus?

The sources we read treat it as not currently accepted, but not all databases say so in the same way.

• Species Fungorum: all eleven Copelandia name records returned by its genus listing show a current name in Panaeolus, including Copelandia cyanescens (Species Fungorum, genus listing).
• The 2023 Panaeolus review says Panaeolina and Panaeolopsis are currently valid genera “but not Copelandia”, citing Index Fungorum and MycoBank, and adds that these names are used inconsistently in the literature (Strauss et al., 2023).
• The 2026 revision goes a step further. It accepts three subgenera in Panaeolus and puts the species formerly placed in Copelandia in a new subgenus, Bresadolomyces, whose type species is Panaeolus cyanescens. The authors write that the name Copelandia Bres. is illegitimate under the Shenzhen Code (Art. 52.1), and that the subgeneric name Panaeolus subg. Copelandia is illegitimate as well (He et al., 2026). That is a recent proposal in one paper and the authors’ reading of the nomenclature code. We cite it as such, not as the settled view of every database.
• GBIF still carries a bare genus entry for Copelandia marked accepted, while treating Copelandia cyanescens as a synonym of Panaeolus cyanescens (GBIF, Copelandia; GBIF, Copelandia cyanescens). Wikidata also has a Copelandia genus item (Wikidata).

In practice, a reader meeting “Copelandia” should read it as a historical genus-level label for species that current registries file under Panaeolus. The 2026 analysis found that the species in the traditional Copelandia group do fall into their own branch of the family tree, which is why the group keeps being discussed even where the genus name is not used.

Which names should not be collapsed into one?

The repeated second word “cyanescens” is not evidence that the two species are the same. Species Fungorum lists no Psilocybe name among the synonyms of Panaeolus cyanescens (Species Fungorum). The other species has its own page: Psilocybe cyanescens: taxonomy and naming confusion. When a comparison involves both, write both names in full.

Does “Blue Meanies” always mean Panaeolus cyanescens?

No. On iNaturalist, Panaeolus cyanescens carries “Blue Meanies” as its preferred common name, and a search of iNaturalist taxa for the phrase returned only that species (iNaturalist taxon record; iNaturalist search). GBIF’s species record also lists “Blue Meanies” as a vernacular name for it (GBIF). So the phrase is a documented common name for this species.

It is not only that. In a 2025 laboratory study of 42 psilocybin-producing fungal strains, Table 1 lists a strain labelled “Blue Meanies” under the genus and species Psilocybe cubensis, and the authors’ own DNA classification of that sample, based on the ITS region, was also Psilocybe cubensis (Cohen et al., 2025). Both uses are documented, and neither cancels the other. Our guide why “Blue Meanies” is an ambiguous name sets out the two uses side by side. A species page should not quietly redirect every occurrence of the phrase to one identity.

For a catalogue or bibliography, record the source’s label, the species it says goes with that label, and how the association was established. A reader should be able to tell whether an entry reflects common usage, a submitted identification or an authenticated study sample.

Why must research results stay attached to the sample?

Genetic identity, measured chemistry and reported human outcomes are three different claims. Evidence for one does not establish the others, and a result for one sample does not carry over to another that merely shares a name. Three documented cases show why.

• Labels and DNA can part ways. In Cohen et al.’s Table 1, three samples labelled with the species name Panaeolus cambodginiensis (strain names Sandose V1, V2 and V3) were classified by ITS sequence as Panaeolus cyanescens. Species Fungorum lists Panaeolus cambodginiensis as the current name behind Copelandia cambodginiensis, so it is a separate name in the registry (Cohen et al., 2025; Species Fungorum, genus listing). A label is something someone chose, and the table reports what that sample’s sequence matched.
• Chemistry varies between collections. The 2023 review notes that psilocybin and psilocin levels vary within and between collections, and reports that P. cyanescens collections from Hawaii contained significantly more psilocybin than collections from Australia and Thailand, which barely contained traces (Strauss et al., 2023).
• A named species is not a guaranteed result. In the 2026 study, psilocybin was not detected in the P. cyanescens specimen the authors tested (collected 29 years earlier), although they describe the species as well known for producing it, and they suggest sample age as a possible reason (He et al., 2026). We do not know the real cause, and neither do the authors.

This page does not give the species a multiplier against Psilocybe cubensis, and it does not rank any name by strength. A defensible comparison needs documented specimens, a stated method and enough samples; what lab studies do and do not establish explains the requirements. The chemistry of the colour change is covered in why magic mushrooms turn blue.

Why does this page not describe what the mushroom looks like?

Because a description needs a verified morphological treatment and expert-reviewed images, and we have not yet had a specialist review of either. The history of the name is better documented here than a diagnostic summary would be, and we would rather show that gap than fill it with a generic photograph or a copied checklist. Even a correctly captioned photograph shows one particular specimen. It cannot show that a similar-looking mushroom is safe.

What is still unsettled?

• Whether the 2026 subgenus Bresadolomyces and its reading of the Copelandia names will be adopted by the registries (unresolved).
• Family placement: Galeropsidaceae in Species Fungorum and both papers, Bolbitiaceae in GBIF (databases disagree).
• Author citation: Species Fungorum and GBIF give “Sacc.”, while the introduction of the 2026 paper writes “(Berk. & Broome) Sacc.” and its taxon treatment writes “Sacc.” (sources differ, so check the registry record when you cite).
• The MycoBank record, which we could not load with our tools, and the original 1887 and 1951 publications, which we did not read (not checked).
• Where the “Blue Meanies” label first appeared in either use; none of the sources we checked says (unknown).

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