The plant group that is a thallus plant between bryophytes and pteridophytes?

The plant group that is a thallus plant between bryophytes and pteridophytes is the liverworts (Marchantiophyta). Liverworts are non-vascular plants that have a flattened, ribbon-like or leaf-like thallus structure, similar to algae, but they are more complex than mosses (bryophytes) and lack true roots, stems, and leaves like pteridophytes. Liverworts are considered to be one of the earliest land plants and are found in moist environments worldwide.