crescent-cup liverwort

Description:

Lunularia cruciata or crescent-cup liverwort is a liverwort of order Marchantiales, and the only species in the genus Lunularia and family Lunulariaceae. The name refers to the moon-shaped cups, from Latin luna, moon. Lunularia occurs commonly in western Europe, where it is native to the region around the Mediterranean. In America, the species grows only as a sterile form, easily recognized by the crescent-shaped cups containing asexual gemmae. The discus-shaped gemmae are readily dislodged from the cups by splashes of rainwater. They can then quickly "take root" and start to grow in suitably damp places, which is why they are so successful in greenhouses. Lunularia is not purely asexual; it can also reproduce sexually with four archegonia arranged in a cross-shaped head bearing diploid sporophyte plantlets. As in other liverworts, the main plant body or thallus is a haploid gametophyte.

Habitat:

Spotted in a fountain, in a very wet location at Parque Nacional de Monfragüe