Under the influence of outer ecosystems, such as the Cerrado and Amazon rain forest, the Pantanal of Mato Grosso is a unique ecosystem. Otherwise his fanerogamic flora is well known, the bryoflora is yet to be properly discovered. As part of Paraguai river basin and located at 94.8km from Cuiabá at 16º15'24"S and 56º36'24"W, the county of Poconé has a population around 30,000 hab. Colects were taken in 1984, 1999 and 2000. Among the Division Bryophyte 12 species in 12 familie were founs. In the Division Marchantiophyta 10 species in two families were found. The better represented family was Lejeuneaceae, with eight species. Five new occurrences to the Centro-Oeste region were found: Trichosteleum fluviale (Mitt.) Jaeg., Frullania arecae (Spreng.) Gottsche, Frullania tetraptera Nees & Mont., Lejeunea glaucescens Gottsche, Lejeunea calcicola Schuster, Lejeunea caespitosa Lindenb. and nine new occurrences to Mato Grosso State were found: Hyophila involuta (Hook.) A. Jaeg., Groutiella apiculata (Hook.) Crum & Steere, Fabronia macroblepharis Schwaegr., Trichosteleum fluviale (Mitt.) Jaeg., Frullania tetraptera Nees & Mont., Lejeunea glaucescens Gottshe, Lejeunea calcicola Schuster and Lejeunea caespitosa Lindenb. Lejeunea calcicola Schuster is mentioned for the second time to Brazil.
Bryophytes; Pantanal; Mato Grosso; Poconé