Jamesoniella undulifolia

Jamesoniella undulifolia, the marsh flapwort, or marsh earwort, is a species of liverwort in the Jungermanniaceae family. It is found in Austria, China, the Czech Republic, Denmark, Finland, France, Germany, Greenland, North Korea, Norway, Poland, Russia, Sweden, Switzerland, and the United Kingdom. Its natural habitat is swamps. It is threatened by habitat loss.