Riccia lamellosa Raddi (Marchantiophyta), a new record for Azerbaijan

The short-lived thallose liverwort Riccia lamellosa (Ricciaceae) is first recorded for Azerbaijan, hence bridging the distribution gap between the Russian Caucasus, Iran and Iraq. Its site conditions in the semi-desert landscape of Qobustan south of Bakı are reported and illustrated. An updated list of Riccia species of the Caucasus ecoregion is provided.