''Chaenothecopsis polissica'' is a species of fossilized

pin lichen Lichens are symbiotic organisms made up of multiple species: a fungus, one or more photobionts (an alga and/or a cyanobacteria) and sometimes a yeast. They are regularly grouped by their external appearance – a characteristic known as their gro ...

in the family

Mycocaliciaceae The Mycocaliciaceae are a family (biology), family of fungi in the order Mycocaliciales, comprising seven genera and approximately 90 species. Originally proposed in 1970 by Alexander Schmidt, the family is characterised by immersed thallus, thal ...

that was discovered in 2021 by Vasyl Heluta and Maryna Sukhomlyn. The

holotype A holotype (Latin: ''holotypus'') is a single physical example (or illustration) of an organism used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of s ...

was recovered from

Rovno amber Rovno amber, occasionally called Ukrainian amber, is amber found in the Rivne Oblast and surrounding regions of Ukraine and Belarus. The amber is dated between Late Eocene and Early Oligocene, and suggested to be contemporaneous to Baltic amber ...

, which formed in

Ukraine Ukraine is a country in Eastern Europe. It is the List of European countries by area, second-largest country in Europe after Russia, which Russia–Ukraine border, borders it to the east and northeast. Ukraine also borders Belarus to the nor ...

during the

late Eocene The Priabonian is, in the International Commission on Stratigraphy, ICS's geologic timescale, the latest age (geology), age or the upper stage (stratigraphy), stage of the Eocene epoch (geology), Epoch or series (stratigraphy), Series. It spans ...

References

Lichen species Lichens described in 2021 Lichens of Eastern Europe Prehistoric fungi Eurotiomycetes {{Eurotiomycetes-stub