Contribuição ao conhecimento da diversidade de hepáticas (Hepaticae) da microrregião do Salgado-PA

Abstract

The Bryophyta division (Hepaticae, Musci, and Anthocerotae) are small-sized, vascular, cryptogamous plants. They have significant importance for terrestrial fauna and flora, serving as ecological indicators, paleocological, mineral deposits, air and water pollution, and erosion controllers. Some species are producers of biologically active substances. In Pará state, the diversity of this group is still under investigation. As part of a project that aims to determine the brioflora of the state of Pará, this work deals specifically with an inventory of the species of liverworts that occur in different types of vegetation, including areas that have suffered severely from anthropic action, such as the northeastern mesoregion of Pará. In a previous step, we studied material collected in the municipality of Viseu and in some municipalities of the Bragantine zone. In this stage, bryophytes were collected in some municipalities of the Salgado micro-region. The identification of the species was done using specialized bibliography and/or comparison with material already identified by specialists. Forty species of liverworts were found, distributed among three families: Lejeuneaceae, Plagiochilaceae and Radulaceae. Cbeilolejeunea rigidula (Nees ex Mont.) Schust and Ceratolejeunea comuta (Lindenb) Schiffn., with 37 and 24 occurrences, respectively, were the most frequent species. Both species were collected in the most different substrates and vegetation types, showing a wide ecological adaptation. These results found in the Salgado micro-region are compared to those found in the Bragantine micro-region and the municipality of Viseu.