Hepatics from Rovno amber (Ukraine): <italic>Nipponolejeunea rovnoi</italic> sp. nov. and <italic>N. solodovnikovii</italic> sp. nov.

Two leafy liverwort species from the late Eocene Rovno amber are described. They are placed in the extant genus <italic>Nipponolejeunea</italic> (Jubulaceae, Porellales, Marchantiophyta) that includes two extant East Asian species and one fossil species described from the Eocene Baltic amber. New fossil species <italic>N. rovnoi</italic> sp. nov. and <italic>N. solodovnikovii</italic> sp. nov. differ from the Baltic <italic>N. europea</italic>, thus making the extinct diversity of the genus exceeding the contemporary species diversity, and such a case is registered for the first time for liverworts. The finding of <italic>Nipponolejeunea</italic> in Rovno amber may indicate the presence of <italic>Abies</italic> in the Eocene of Ukraine, since at the southern border of its distribution in Japan extant species the genus grows only on fir trunk. This is in a good concordance with the recent finding in Rovno amber the longhorn beetle <italic>Poliaenus europaeus</italic>, also associated with fir trees. [ABSTRACT FROM AUTHOR]