El género hymenasplenium (aspleniaceae) en Argentina

Fil: Giúdice, Gabriela Elena. Cátedra de Morfología Vegetal. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Luna, María Luján. Cátedra de Morfología Vegetal. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Ganem, Alejandra. Cátedra de Botánica General. Facultad de Ciencias Agrarias. Universidad Nacional de Jujuy; Argentin

Estudio palinológico en especies de Asplenium (Aspleniaceae) de Argentina

Palynological study in Asplenium species (Aspleniaceae) from Argentina. The genus Asplenium L. is represented in Argentina by about 38 species, being its habit terrestrial, saxicolous or ephiphytic. In this contribution we complete the palynological study of the genus in this country. The material was processed according to standard techniques for observation under light and scanning electron microscopes. The spores are monolete, the wall formed by the homogeneous exospore, with smooth surface, and the camerate and folded perispore. Two types of folds, winged and ridged, are registered. A variability in the density of the perforations in the outer layer of the perispore, and the margin and sculptural elements of the folds and in the areas between them, are also observed. Spores of analyzed taxa are described and illustrated with pictures using scanning electron microscope.El género Asplenium L. se halla representado en Argentina por cerca de 38 especies, siendo su hábito terrestre, saxícola o epífito. En la presente contribución se completa el estudio palinológico del género en este país. El material fue procesado de acuerdo a técnicas clásicas para su observación con microscopios óptico y electrónico de barrido. Las esporas son monoletes, la pared está conformada por el exosporio homogéneo de superficie lisa, y el perisporio camerado y plegado. Se distinguen dos tipos de pliegues: alados y lomados y se observa variabilidad en cuanto a la densidad de las perforaciones del estrato externo del perisporio, a los tipos de margen y los elementos esculturales de los pliegues y a las áreas entre pliegues. Se describen las esporas de los taxa estudiados y se ilustran con fotografías al microscopio electrónico de barrido

Diversidad de helechos y licofitas del Parque Nacional Calilegua, provincia de Jujuy, Argentina

Diversity of ferns and lycophytes from Calilegua National Park, Jujuy Province Argentina. The biogeographic province of the “Yungas” is considered by the UNESCO as a Biosphere Reserve. In this zone, Calilegua National Park is one of the “cores” of the Yungas, where ferns and lycophytes grow as epiphytic, terrestrial or saxicoulous in different environments. The aim of this study is to make known the ferns and lycophytes that inhabit in Calilegua National Park, in order to provide information on Yungas biodiversity. For this purpose, 5 field trips were performed during december-May 2007-2011. Voucher specimens were deposited in the following herbaria: JUA, LP and RCV. Other herbaria and specific bibliography were also consulted. According to this study 103 taxa (species and varieties) of ferns and lycophytes inhabit in Calilegua National Park, grouped in 18 families and 43 genera. Six species are first recorded for the Province of Jujuy. Nomenclatural updates and keys for taxa identification are also given.La provincia biogeográfica de las Yungas es considerada por la UNESCO como una de las Reservas de la Biosfera. El Parque Nacional Calilegua es uno de los “core” de estas Yungas, donde los helechos y licofitas crecen en diferentes ambientes como epifitos, terrestres o saxicolas. El objetivo de este trabajo es dar a conocer los helechos y licofitas que habitan en el Parque Nacional Calilegua, con el fin de contribuir a la información sobre la biodiversidad en las Yungas y aportar a su conservación. El estudio se realizó teniendo en cuenta el material colectado en viajes de campo por diferentes zonas del Parque, durante los meses de diciembre a mayo de los años 2007 a 2011. Asimismo, se consultaron distintos herbarios nacionales y bibliografía específica. Se registraron en el PN Calilegua un total de 103 taxones (especies y variedades) de helechos y licofitas, agrupados en 18 familias y 43 géneros. Se dan a conocer seis nuevas citas para la provincia de Jujuy y se presentan actualizaciones nomenclaturales y claves para la identificación de los taxa registrados

Diversidad de helechos y licófitas de la Reserva Natural Punta Lara, Buenos Aires, Argentina

Punta Lara Natural Reserve shelters the relict of the Southernmost riparian forest in the world, where the flora is threatened by the anthropic expansion and by the introduction of exotic species. In this area the ferns and lycophytes grow in particular environments as marshland, grassland and marginal forest. The aim of this work was to evaluate the diversity of ferns and lycophytes that inhabit in Punta Lara Natural Reserve. Field trips were conducted from 2006 to 2009 and local herbaria and specific bibliography were also revised. As a result of our study twenty four taxa of ferns and lycophytes were recognized. Their habit was mainly terrestrial (70%), fewer aquatic (17%) and epiphytic (13%). Five native taxa were scarcely recorded whereas two native species previously documented were not found. We assume that the main threats on ferns and lycophytes populations in Punta Lara Reserve are: removal for comercialization, invasion by exotic species and climatic fluctuations (drought periods). Keys for taxa identification are given and strategies for the conservation of threatened taxa are proposed