In: Sydowia 77, (2025): 81-92; ISSN 0082-0598, DOI 10.12905/0380.sydowia77-2025-0081, Published online on October 28, 2024

European Pluteus with greenish blue tinges: taxonomic novelties and notes on distribution, ecology and psychotropic status of Pluteus izurun

Hana Ševciková,* Roman Manák, Jan Borovicka, Ida Broman Nielsen, Bálint Dima, Tobias Guldberg Frøslev, Lucie Janecková, Martin Kuchar, Gyozo Tóth & Ekaterina Malysheva

1 Department of Botany, Moravian Museum, Zelnýtrh 6, 659 37 Brno, Czech Republic, hsevcikova@mzm.cz
2 Educational and Information Centre Bílé Karpaty, o. p. s., Námestí míru 664, 698 01 Veselí nad Moravou, Czech Republic
3 Institute of Geology of the Czech Academy of Sciences, Rozvojová 269, 165 00 Praha 6, 165 00 Prague, Czech Republic
4 Center for Evolutionary Hologenomics, Globe Institute, University of Copenhagen, Øster Farimagsgade 5,
1014 Copenhagen, Denmark
5 Department of Plant Anatomy, Institute of Biology, Eötvös Loránd University, Pázmány Péter sétány 1/C,
H-1117 Budapest, Hungary
6 Forensic Laboratory of Biologically Active Substances, Department of Chemistry of Natural Compounds, University of
Chemistry and Technology Prague, Technická 5, 166 28 Prague 6—Dejvice, 166 28, Czech Republic
7 Psychedelic Research Center, National Institute of Mental Health, Topolová 748, 250 67 Klecany, Czech Republic
8 Lövölde u.38. I/5, H-8000 Székesfehérvár, Hungary
9 Shatelena Str. 20, 194021 St. Petersburg, Russia
* e-mail: hsevcikova@mzm.cz

Ševcíková H., Manák R., Borovicka J., Broman Nielsen I., Dima B., Frøslev T.G., Janecková L., Kuchar M., Tóth G. & Malysheva
E. (2024) European Pluteus with greenish-blue tinges: taxonomic novelties and notes on distribution, ecology and psychotropic
status of Pluteus izurun – Sydowia 77: 81–92.

Some Pluteus species of section Pluteus (Pluteaceae, Agaricales) are characterized by greenish-blue tinges on a pileus and/
or stipe which usually indicates the presence of psychoactive tryptamines. In this study, we focused on three taxa of this group
with unresolved taxonomy. Based on both molecular and morphological features, Pluteus salicinus var. obscurior is combined as
P. cervinus f. obscurior, and P. nigroviridis is placed as conspecific or near to P. salicinus. Pluteus caeruleovirescens is not accepted
in the genus as Pluteus and synonymized with Leucoagaricus leucothites. Furthermore, P. izurun, so far known only from
its type locality in Spain, is reported from the Czech Republic. Chemical analysis confirmed content of psilocybin, psilocin, baeocystin,
and aeruginascin in this fungus which makes P. izurun another psychoactive mushroom species in Europe.

Keywords: Pluteus glaucotinctus group, Leucoagaricus leucothites, type studies, tryptamines, psilocybin. – 1 new combination,
1 new synonym