A significant body of valuable data about the myxomycetes of Ukraine lies in a “grey zone”. This encompasses undigitized historical books and articles published in languages such as Polish, French, or German, as well as proceedings from local conferences, articles featured in local scientific journals, and annual reports submitted to public authorities by employees of protected areas, published in Ukrainian or Russian. Yet, due to their exclusive existence in print and often the Cyrillic alphabet, these publications remain neither findable nor accessible to a wider audience.

The datasets presented here aim to summarize over 150 years of myxomycetes research in Ukraine. The majority of the data has been extracted from published literature sources spanning the years 1842 to 2023, with a minor supplement from unpublished herbarium specimens. The datasets include 5036 georeferenced occurrences, 339 taxa and 91 literature sources. Seventy one of the used literature sources, mostly published before 2010, we uploaded to zenodo.org and available in open access.