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      Oamundaceae en Argentina, Paraguay y Uruguay

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          Abstract

          En este estudio se actualiza la taxonomía y distribución de las Osmundaceae, familia de helechos que habitan bosques y humedales subtropicales de la Argentina, Paraguay y Uruguay. Actualmente la familia comprende cuatro géneros, dos de ellos, con una especie cada uno, estan presentes en la región estudiada. Se acepta Osmunda spectabilis como una especie válida, diferente de O. regalis, la que no se encuentra presente en el área de estudio. Se reconoce a nivel de género a Osmundastrum con una única especie O. cinnamomeum var. cinnamomeum. Se incluyen una clave para los géneros, descripciones, la sinonimia relevante para América del Sur, distribuciones e ilustraciones de las especies. Se lectotipifica a Osmunda imbricata, Osmunda palustris y Osmunda spectabilis var. brasiliensis.

          Translated abstract

          In this study we update the taxonomy and distribution of the Osmundaceae, a family of ferns that inhabits the subtropical forest and wetlands of Argentina, Paraguay and Uruguay. Currently, the family comprises four genera, two of them, with one species each, are represented in the study region. Osmunda spectabilis is accepted as a valid species, distinct from O. regalis, which is not present in the study area. Osmundastrum is recognized at the generic level with only one species Osmundastrum cinnamomeum var. cinnamomeum. A key to the genera, descriptions, relevant synonymy for South America, distributions, and illustrations of the species are included. Osmunda imbricata, Osmunda palustris and Osmunda spectabilis var. brasiliensis are lectotypified.

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          Phylogeny and evolution of ferns (monilophytes) with a focus on the early leptosporangiate divergences.

          The phylogenetic structure of ferns (= monilophytes) is explored here, with a special focus on the early divergences among leptosporangiate lineages. Despite considerable progress in our understanding of fern relationships, a rigorous and comprehensive analysis of the early leptosporangiate divergences was lacking. Therefore, a data set was designed here to include critical taxa that were not included in earlier studies. More than 5000 bp from the plastid (rbcL, atpB, rps4) and the nuclear (18S rDNA) genomes were sequenced for 62 taxa. Phylogenetic analyses of these data (1) confirm that Osmundaceae are sister to the rest of the leptosporangiates, (2) resolve a diverse set of ferns formerly thought to be a subsequent grade as possibly monophyletic (((Dipteridaceae, Matoniaceae), Gleicheniaceae), Hymenophyllaceae), and (3) place schizaeoid ferns as sister to a large clade of "core leptosporangiates" that includes heterosporous ferns, tree ferns, and polypods. Divergence time estimates for ferns are reported from penalized likelihood analyses of our molecular data, with constraints from a reassessment of the fossil record.
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            Index Herbariorum: a global directory of public herbaria and associated staff

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              Fern Phylogeny Inferred from 400 Leptosporangiate Species and Three Plastid Genes

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Journal
                darwin
                Darwiniana, nueva serie
                Darwiniana, nueva serie
                Instituto de Botánica Darwinion & Museo Botánico de Córdoba (San Isidro, Buenos Aires, Argentina )
                0011-6793
                1850-1699
                July 2015
                : 3
                : 1
                : 27-37
                Affiliations
                [01] Río Cuarto Córdoba orgnameUniversidad Nacional de Río Cuarto orgdiv1Facultad de Ciencias Exactas, Físico-Químicas y Naturales orgdiv2Departamento de Ciencias Naturales Argentina
                [02] San Isidro Buenos Aires orgnameCONICET orgdiv1ANCEFN orgdiv2Instituto de Botánica Darwinion Argentina
                Article
                S0011-67932015000100003
                5bb8668c-beaf-4854-9530-70158f4a47b8

                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: 55, Pages: 11
                Product

                SciELO Argentina


                América del Sur austral,Osmunda,Osmundastrum,Taxonomía,Southern South America,Taxonomy

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