This study is a floristic survey of the Bryopsida from the "cerrado" and from the gallery forest of the Sete Cidades National Park in the municipalities Piracuruca and Brasileira, in the State of Piauí, Brazil (04º0515'S and 41º30-45'W). Twenty-two taxa were determined from the following families: Bartramiaceae (1 esp.), Bryaceae (2 esp.), Calymperaceae (2 esp.), Dicranaceae (3 esp.), Erpodiaceae (1 esp.), Fissidentaceae (6 esp.), Hypnaceae (1 esp.), Leucobryaceae (1 esp.), Pottiaceae (2 esp.), Sematophyllaceae (2 esp.) and Stereophyllaceae (1 esp.). Weisiopsis nigeriana (Egun. & Olar.) Zand. is the first record of this species to Brazil, Campylopus heterostachys (Hampe) Jaeg. is the first of this species found in Brazilian northeast, and Bryum capillare Hewd., Bryum cruegeri Hampe ex C.Müller, Philonotis uncinata (Schwaegr.) Brid., Vesicularia vesicularis (Schwaegr.) Broth., Sematophyllum subsimplex (Hedw.) Mitt., Trichosteleum fluviale (Mitt.) Jaeg., Hyophila involuta (Hook.) Jaeg. & Sauerb., Calymperes palisotii Schwaegr. ssp. richardii (C.Müller) S.Edwards, Fissidens guianensis Mont., Fissidens intermedius C.Müller, Fissidens prionodes Mont., Fissidens goyazensis Broth. and Fissidens zollingeri Mont. are new to the State of Piauí. For each taxon a description is given along with references, illustrations and geographical distribution.
mosses; Bryopsida; cerrado; Piauí
