Class Hepaticopsida, also referred to as the liverworts, is a group of non-flowering plants that typically grow in wet, shaded habitats. Synonyms for this class include the Hepaticae, Marchantiophyta, and Marchantiales. Hepaticae is a term that is often used to describe this class in a narrower sense, referring to the thallus (leafy structure) of the plant. Marchantiophyta is a more modern term that is frequently used to encompass all of the liverwort species. Marchantiales, on the other hand, refers specifically to an order of the liverworts that includes many species commonly found in North America and Europe. Regardless of the terminology used, these plants are important components of many ecosystems and are fascinating subjects for botanical study.