The Briophyta division (Hepaticae, Musci, and Anthocerotae), despite its great importance to man and the environment, as erosion controllers, ecological indicators, paleocological, mineral deposits, and air and water pollution, as producers of various biologically active substances, among other uses, is little known, regarding its specific diversity in the Amazon. It is known that of approximately 14,500 species of mosses, 6500 species of liverworts and 300 species of anthocerans described worldwide, only 3% are known for the Amazon region. This work is part of a project that aims to determine the brioflora of the state of Pará. Its specific objective is to inventory the species of liverworts that occur in different types of vegetation, including deforested areas and primary forests that still exist in the mesoregion of northeastern Pará. In the current stage, only material collected in the different municipalities of the Bragantine zone and the municipality of Viseu was studied. The identification of species was processed using specialized bibliography and/or comparison with material from the Goeldi Museum Herbarium (MG), already identified by specialists. Among the main results found, 44 species of liverworts were identified, belonging to six families, with the Lejeuneaceae family standing out significantly, both in diversity of species (37) and number of occurrences (184). The most frequent species were Cheilolejeunea rigidula (Nees ex Mont.) Schust and Ceratolejeunea cornuta (Líndenb) Schiffn. with 29 and 28 occurrences, respectively. Both species were collected in the most different substrates and vegetation types, showing a wide ecological adaptation.
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