Found by Reddit user infinitebeing_ who first posted to the subreddit r/fimetaria. Reposted here with their permission. These were growing on horse manure in the south coast of England. The separable gill edge is clearly visible (zoom in on first two images).
Psilocybe species. Growing in cow dung. Striated cap. Woody stipes. Deep blue bruising. Getting sequenced
Psilocybe Subsecotioid
This samples are pubblished into a scientific article [Fabio Mao Valletta (2023): “Contribution to the knowledge of two species of psilocybin mushrooms with high therapeutic potential found along the Central-Southern Apennines (Italy): Psilocybe serbica M.M. Moser & E. Horak and Psilocybe semilanceata (Fr.) P. Kumm. Chorological observations”. Bulletin of Regional Natural History (BORNH) Vol.3, no.2, pag 35 https://doi.org/10.6093/2724-4393/10411]. The sample collection, have been donated from the author and the “PsiloSoma Project”, is deposited and preserved for further studies, into the Herbarium of “Società dei Naturalisti in Napoli” (Naples, Italy).
This samples are pubblished into a scientific article [Fabio Mao Valletta (2023): “Contribution to the knowledge of two species of psilocybin mushrooms with high therapeutic potential found along the Central-Southern Apennines (Italy): Psilocybe serbica M.M. Moser & E. Horak and Psilocybe semilanceata (Fr.) P. Kumm. Chorological observations”. Bulletin of Regional Natural History (BORNH) Vol.3, no.2, pag 39 https://doi.org/10.6093/2724-4393/10411]. The sample collection, have been donated from the author and the “PsiloSoma Project”, is deposited and preserved for further studies, into the Herbarium of “Società dei Naturalisti in Napoli” (Naples, Italy).
The handwritten note implies that maybe it was actually collected in June.