Distribution and threat status of the liverwort Mannia triandra (Scop.) Grolle (Aytoniaceae, Marchantiophyta) in Montenegro

We summarise all known data on the liverwort Mannia triandra (Scop.) Grolle in Montenegro. This species was previously only known from literature. During our fieldwork between 2016 and 2022, we were able to detect it in seven parts of the country at 18 localities. It occurs mainly in the south-western part of the country, at altitudes between 40 and 1720 m above sea level, mainly in small caves or crevices in north, north-east and east exposure. These are mostly small populations with only a few individuals. Due to this increase in recent occurrences, Montenegro has a great responsibility for the conservation of this rare species, which is protected and endangered throughout Europe. However, following the IUCN criteria, we estimate that Mannia triandra should be considered endangered (VU) in Montenegro, too.