Licófitas e monilófitas de duas zonas de preservação da vida silvestre da usina hidrelétrica de Tucuruí, Pará, Brasil.

Abstract

This work presents a floristic survey of the lycophytes and monilophytes of the “Zonas de Preservação da Vida Silvestre da Usina Hidrelétrica de Tucuruí”, state of Pará, Brazil. This area is located in southeastern region of Pará and comprises an area of about 29.700 ha, which is mainly represented by open tropical rainforest. The material was collected during three field expeditions performed in June and September 2008, and March 2009. The material was collected and herborized according to the usual techniques for vascular plants. Specialized literature was used for the analysis and identification of the collected specimens and comparison with herbarium material and in some cases confirmation and identification by specialist. The data showed the occurrence of 18 families, 37 genera and 82 species. The families with the largest number of species were Pteridaceae with 21 species, followed by Polypodiaceae with nine species, Hymenophyllaceae with ten species, and Thelypteridaceae with six species. The most representative genera were Adiantum (Pteridaceae) with 14 species, Thelypteris (Thelypteridaceae) with six, Asplenium (Aspleniaceae), Didymoglossum, and Trichomanes (Hymenophyllaceae) with five species each. Four species are new references for the state of Pará (Ctenitis refulgens (Klotesch ex Mett.) C.Chr. ex Vareschi, Didymoglossum ovale Fourn., Danaea nodosa (L.) Sm. e Pecluma hygrometrica (Spligt.) Price). Two species are new to science, Thelypetris sp. and Adiantum sp. The majority of the species was terrestrial (47 species) and presented American distribution (35).