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      Sobre la presencia de Megalastrum substrigosum (Dryopteridaceae) en Argentina

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          Abstract

          En este trabajo se cita por primera vez a Megalastrum substrigosum para Argentina, en el departamento de San Pedro, provincia de Misiones. Se presenta una descripción general de la especie, el mapa de su distribución en el país e ilustraciones sobre los caracteres más importantes para su determinación. Se incluye una clave dicotómica para diferenciar las tres especies presentes en Misiones.

          Translated abstract

          This paper presents the first record of Megalastrum substrigosum from Argentina, in Department San Pedro, Misiones province. We present a description of the species, a distribution map, and illustrations of the diagnostic characters. A dichotomous key is included to differentiate the three Megalastrum species from Misiones.

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          Fern Phylogeny Inferred from 400 Leptosporangiate Species and Three Plastid Genes

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            Phylogeny and historical biogeography of the lastreopsid ferns (Dryopteridaceae).

            • Premise of the study: As currently circumscribed, Lastreopsis has about 45 species and occurs in Australia, southern Asia, Africa, Madagascar, and the neotropics. Previous molecular phylogenetic studies suggested that Lastreopsis is paraphyletic. Our study focuses on resolving relationships among the lastreopsid ferns (Lastreopsis, Megalastrum, and Rumohra), the evolution of morphological characters, and an understanding of the temporal and spatial patterns that have led to the current diversity and geographical distribution of its extant species.• Methods: Phylogenetic relationships were recovered under Bayesian, maximum likelihood, and maximum parsimony methods, using a data set of four plastid markers. Divergence time estimates were made using BEAST, and the biogeographic hypotheses were tested under the DEC model and the RASP/S-DIVA methods.• Key results: Lastreopsis was recovered as paraphyletic, and at least one of its clades should be recognized as a distinct genus, Parapolystichum. Coveniella poecilophlebia and Oenotrichia tripinnata were nested within Lastreopsis s.s., Megalastrum and Rumohra as sister to the Lastreopsis s.s., and the Lastreopsis amplissima clades. The initial diversification of the lastreopsids took place at about 56.55 Ma, from a neotropical ancestor.• Conclusions: Taxonomic recognition of Parapolystichum is warranted to preserve the monophyly of Lastreopsis. Diversification among the main clades of the lastreopsid ferns was influenced by climatic and geological changes in the southern hemisphere. The biogeographic history of the group is intimately related to the trans-Antarctic corridor between Australia and South America, with evidence for multiple lineage interchanges between Australia and South America during the Oligocene and the Eocene epochs.
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              Pteridofitas de la Reserva "Valle Del Arroyo Cuñá Pirú" (Misiones, Argentina)

              En la Reserva "Cuñá Pirú" se registraron un total de 9 familias, 29 géneros y 52 especies y taxones infraespecíficos. El género mejor representado es Asplenium con 8 especies, dos de ellas novedades para la flora argentina. El resto de los géneros tienen 1-3 especies. Estas plantas se hallan preferentemente en el interior de la selva y en el borde de los caminos y arroyos. Se presentan claves dicotómicas para la determinación de los grupos y entidades, como así también referencias bibliográficas, distribucionales y ecológicas.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                bsab
                Boletín de la Sociedad Argentina de Botánica
                Bol. Soc. Argent. Bot.
                Sociedad Argentina de Botánica (Córdoba, Córdoba, Argentina )
                1851-2372
                December 2016
                : 51
                : 4
                : 741-744
                Affiliations
                [02] CABA orgnameCONICET orgdiv1Museo Argentino de Ciencias Naturales Bernardino Rivadavia Argentina
                [01] La Plata orgnameUNLP orgdiv1Facultad de Ciencias Naturales y Museo orgdiv2Cátedra de Palinología Argentina
                Article
                S1851-23722016000400015
                4b77a3fd-6e76-47e2-8082-e6864ed7a555

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

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                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 11, Pages: 4
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                SciELO Argentina


                Megalastrum substrigosum,Dryopteridaceae,Misiones,Argentina

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