A new fossil species of a liverwort of the Frullania genus (Frullaniaceae, Marchantiophyta) from the Miocene amber of Simojovel de Allende, Chiapas, Mexico

The fossil record based on liverworts in Mexico remains poorly studied. To date, they have been documented only in Miocene amber deposits from Chiapas, southern Mexico. From this same amberiferous locality, here we described a new fossil species belonging to the Frullania genus. This plant is characterized by irregular, terminal branching of the Frullania type. Lobes obliquely oblong-rounded with rounded apex, sometimes with an inconspicuous one-celled apiculus. Ocelli are present in the lobes. Lobules distant from the stem, obliquely extended, inflated, some of the wider in the middle, narrowing toward its apex. Underleaves distant, lateral margins angular. This new record represents the second report of this genus for Mexico, indicating that the flora represented by liverworts was more important in southern Mexico during the Early Miocene.