Agustina YañezMuseo Argentino de Ciencias Naturales "Bernardino Rivadavia" · Vascular Plants Division - Botany - MACN
Agustina Yañez
Doctor (Biology, Botany)
I am interested in the biodiversity, morphology (+palynology) & evolution of Ferns & Lycophytes from Paranaense forest
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54
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197
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Introduction
Additional affiliations
March 2008 - present
April 2011 - March 2016
Education
April 2011 - February 2016
February 2005 - October 2010
Publications
Publications (54)
Herein, we report the presence of a plant paleocommunity dominated by ferns of the family Osmundaceae embedded in siliceous chert blocks from the only known Mesozoic, fossiliferous geothermal deposits, from the La Matilde Formation (Middle-Upper Jurassic), in the Deseado Massif, southern Patagonia, Argentina. A total of 13 blocks sampled in an area...
Background and aims: In this work, the ferns and lycophytes of the Paisaje Protegido Cerro Mbororé, Oberá, Misiones, Argentina are studied. The phytogeographic importance of the area is discussed, since it is located in the transition between the District of the Mixed Forests and the District of the Fields, in the Amazonian Domain from the country....
The South America Dry Diagonal (SADD) is the most extensive and continuous portion of dry vegetation on the continent, characterised by lower rainfall and a marked dry season. Epiphytes are very poorly known and understudied in this area, even though they represent a high proportion of plant diversity in South America. Here, we compiled a dataset o...
The Avellaneda and Quilmes coastal biocorridor is part of one of the areas with the greatest diversity of plant and animal species in the Buenos Aires Metropolitan Area (AMBA). There are two main factors that can explain these high levels of biodiversity: its geographical location and its environmental heterogeneity. The corridor is geographically...
El Corredor costero de Avellaneda y Quilmes, en la Provincia de Buenos Aires, posee bosques y selvas en galería. Esto es posible porque uno de sus ambientes más diversos es el albardón, una elevación del terreno con forma de loma, de gran extensión, que se dispone paralela al Río de la Plata, junto a las zonas inundables de la costa de Avellaneda,...
With only four species, Pteridium is one of the most-known fern genera for its role as pioneer in ecological succession and for being an aggressive weed. Despite its current wide distribution that extends to almost the entire world, there is a relatively small number of fossil records of macrofossils and palynological assemblages
related to or comp...
Pteridium esculentum es un helecho ampliamente distribuido en regiones templadas y cálidas del hemisferio sur. Si bien ha sido reconocido como una maleza agresiva y su ciclo de crecimiento ha sido estudiado a nivel local en muchos países, las condiciones climáticas óptimas para su establecimiento son poco conocidas debido a la diversidad de hábitat...
Pteris has numerous representatives of Asian and Oceanic origin naturalized in America, some of them recognized as invasive weeds. Pteris ensiformis was introduced in America in the middle of the 19th century and subsequently naturalized in USA and Central America, but the records of its distribution in South America are isolated and the establishm...
En el año 2013 fue declarada como Reserva Natural Privada de Objetivo Definido Mixto Educativo y Botánico la Reserva Natural Sierras Grandes, la cual junto con el Parque Provincial Ernesto Tornquist y Monumento Natural Cerro de la Ventana, conforman la Unidad de Conservación Ventania en la provincia de Buenos Aires. RNSG conserva 2741 hectáreas de...
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La colección de líquenes del Herbario Nacional de Plantas Celulares del Museo
Argentino de Ciencias Naturales “Bernardino Rivadavia” (BA-MACN) posee un
elevado valor histórico tanto por la antigüedad de muchos de sus ejemplares, que datan de fines del siglo XIX y principios del siglo XX, como por la relevancia de sus
colectores e identificadores. A...
Background and Aims:
Goeppertella has been postulated as a monophyletic group, whose precise position within the Gleichenoid families Dipteriaceae and Matoniaceae, remains poorly understood. Previously described Goeppertella specimens are based on frond fragments and its fertile morphology is represented by a few, poorly preserved specimens. We de...
We undertook a molecular phylogenetic revision of hayscented ferns (Dennstaedtiaceae: Dennstaedtioideae) using four plastid markers. Our sampling represents ca. 40% of the extant diversity and includes the type species for each of the relevant segregate genera. We coded 18 discrete morphological characters which we used to find diagnosable clades....
Hypolepis ×paulistana was described in 2016 as a putative hybrid, known from a single gathering. The hybrid status of these plants was based solely on the intermediate morphology of the sporophyte, when compared to its presumed parent species. These were thought to be H. stolonifera and H. rugosula, but, H. rigescens (Kunze) T. Moore could not be e...
The Yabotí Biosphere Reserve (Prov. Misiones, Argentina) with 221,155 ha, represents one of the southernmost relicts of the Paranaense forest. Currently, a project is being developed in the area to inventory and describe the ferns and lycophytes. As a result of these studies, we identify a new species of Amauropelta, A. yabotiensis. Within this gen...
Goeppertella es un género de helechos del Triásico y Jurásico presente en ambos Hemisferios, asignado a la familia Dipteridaceae según los esquemas clásicos debido, principalmente, a su venación reticulada característica. Sin embargo, morfológicamente Goeppertella presenta diferencias notables respecto a otras dipteridáceas fósiles y actuales. Aunq...
Background and aims: Acrostichum danaeifolium is a widely distributed species in the Neotropics, growing in freshwater or saltwater habitats. In Argentina and Paraguay are scarce records cited by previous papers. The objective of this work is to study A. danaeifolium for Argentina and Paraguay, emphasizing the review of its distribution and the his...
The riparian forest is one of the most diverse environments of the La Plata River plains. It is represented by patches of humid forests, which are a valuable source of ecosystem services and have recreational and educational potential. However, the riparian forest has undergone constant modification, worsened by private real-estate developments and...
Megalastrum oreocharis is cited in Argentina for the first time. Within Megalastrum, this species differs from the others in Misiones province, for the presence of rachis, costae and veins hairs greater than 0.5 mm and echinate spores. The careful study of microcharacters within the genus Megalastrum has become an important tool to find records of...
Currently, in Argentina 368 species of true ferns (i.e. Polypodiopsida class) are distributed throughout the country, however, only four of them have been mentioned until now as weeds and ruderal species. The goal of this work was to generate an update of weedy ferns from Argentina, including morphology, distribution, and type of weed according to...
La familia Asteraceae está constituida por aproximadamente 40 tribus que representan sus diversos linajes evolutivos. Entre ellas se destacan las tribus Cardueae y Eupatorieae por su alta riqueza (i.e. más de 2200 especies en cada una) y una amplia distribución geográfica mundial. Ambas tribus incluyen especies de importancia económica: cultivos al...
Resumen São apresentados os resultados do levantamento florístico das angiospermas da APA Municipal do Rio Vermelho/Humboldt, localizada em área de Mata Atlântica no sul do Brasil. As coletas foram realizadas entre os anos de 2004 e 2017, e a identificação das espécies foi baseada em consulta bibliográfica, comparação com acervos de herbários e aux...
En Argentina se distribuyen 368 especies de helechos (clase Polypodiopsida) de las cuales 25 han sido recientemente registradas como malezas. Se reconocen como malezas aquellas especies de plantas que interfieren en las actividades humanas debido a que crecen en un lugar y un tiempo indeseados. Se las clasifica en segetales (malezas de cultivos y a...
El helecho arborescente Alsophila setosa es un huésped frecuente de epífitas ya que posee rizomas con bases foliares persistentes y raíces caulógenas que proveen un sustrato óptimo. En Misiones, Argentina, se han citado diversas angiospermas y 21 especies de helechos epífitos sobre esta especie. Se evaluó la existencia de patrones de distribución d...
Introducción y objetivos: Los caracteres palinológicos relacionados con la ornamentación y morfología general de las esporas son fundamentales en la sistemática de helechos y Licofitas y, por ende, aportan valiosa información en el esclarecimiento de las relaciones filogenéticas entre los grupos. Asimismo, las esporas también pueden reflejar cierto...
Dennstaedtia es un género de helechos distribuido en regiones tropicales y templado-cálidas del mundo, representado por ca. 26 especies en el neotrópico. Muchos de estos taxa son difíciles de distinguir entre sí debido a que algunos caracteres vegetativos diagnósticos no pueden observarse sin la presencia de especímenes de herbario completos. Como...
Since I was an undergraduate biology student at the National University of La Plata, I knew that the forest was going to be my work office. The exuberant vegetation, the thick dampness over the skin, the constant sounds changing through the day, and the cool shade of the understory all captivated me from the beginning. And because the understory wa...
Epiphytes are hyper‐diverse and one of the frequently undervalued life forms in plant surveys and biodiversity inventories. Epiphytes of the Atlantic Forest, one of the most endangered ecosystems in the world, have high endemism and radiated recently in the Pliocene. We aimed to (1) compile an extensive Atlantic Forest data set on vascular, non‐vas...
Based on the morphological study of ca. 470 specimens and geographical studies, we here propose the recognition of six morphotypes within the South American Pteridium esculentum (= P. arachnoideum s.l., or P. aquilinum var. arachnoideum sensu Tryon, or P. esculentum subsp. arachnoideum sensu Thomson). Three of them are widely distributed and well-d...
The genera of Dennstaedtiaceae have sporophytes with very different morphological characteristics between each other, and this feature has made difficult the systematic circumscription of the family. This reason makes necessary the study of new characters that allow a better understanding of the relations within the group. The spore morphology and...
Cynara cardunculus (Asteraceae, Cardueae), “cardo de Castilla”, es una especie introducida en el sur de América del Sur, California, Australia y Nueva Zelanda. Registrada en América del Sur desde el siglo XXVIII es escaso el conocimiento sobre su rango de distribución. El objetivo del trabajo fue obtener su distribución actual y modelar la aptitud...
Acanthostyles buniifolius es un arbusto nativo distribuido en el sur de América del Sur, desde el nivel del mar alcanzando los 3000 m. Presenta un patrón distribucional ya reconocido para otros taxones que conecta las Sierras Pampeanas con las Sierras Subandinas, Tandilia-Ventania, Uruguay y el sur de Brasil. El objetivo del presente trabajo fue mo...
Alsophila setosa (Cyatheaceae) es un helecho arborescente que crece en la selva misionera. Esta especie se caracteriza por la gran altura que pueden alcanzar algunos individuos, que alcanzan más de 9 metros. Las poblaciones de este grupo comenzaron a desaparecer debido al impacto causado por la sobreexplotación maderera y el avance de la frontera a...
Los helechos son reconocidos por su posición ancestral entre las plantas y su uso ornamental. A pesar de que mundialmente se han registrado más de 60 especies de helechos malezas o ruderales, en Argentina existen escasos estudios al respecto. El objetivo de este trabajo es realizar una actualización de la información sobre la diversidad y distribuc...
Pteridium es un género cosmopolita de helechos ampliamente reconocido por su toxicidad y carácter invasor. Las especies del género se caracterizan por presentar una enorme variabilidad morfológica, lo que ha dificultado su clasificación. Dicha variabilidad ha sido poco estudiada en P. esculentum subsp. arachnoideum (P. arachnoideum s.l.), único rep...
Anogramma chaerophylla belongs to a fern genus with annual sporophytes and potentially
perennating gametophytes. In the studied area, Natural Reserve Punta Lara, the plants grow stressed
mainly by pollution and the invasion of exotic species. As a part of a project on conservation of ferns
inhabiting Buenos Aires province, the objectives of this wo...
About the presence of Megalastrum substrigosum (Dryopteridaceae) in Argentina. 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 diff...
The fern genus Anogramma is characterized by the presence of annual sporophytes and tubercles that persist through dry periods. Tubercles may host embryos that develop when climatic conditions are more favorable. As information on the structure of the tubercle and sporophyte of Anogramma chaerophylla is incomplete, the objective of this work was to...
The spore morphology and wall ultrastructure of Microlepia speluncae and Pteridium arachnoideum from the Paranaense Province were analyzed with LM, SEM and TEM and a comparative analysis was carried out. In both species the spores are covered by a three-dimensional network of threads branched and fused, tangentially arranged to the surface, and som...
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.
An updated synopsis of the genus Hypolepis (Dennstaedtiaceae) from Argentina is presented, including the first report of H. stolonifera var. stolonifera for the country and the description of a new variety: Hypolepis stolonifera var. delasotae, named in honour of pteridologist Elías Ramón de la Sota. Four taxa are recognised in Argentina: Hypolepis...
A morphological analysis of the genus Dennstaedtia (Dennstaedtiaceae) from Argentina is carried out and distributional data updated. the studied species are: Dennstaedtia cicutaria, D. dissecta, D. glauca and D. globulifera. until now, the informa-tion concerning the genus in Argentina was fragmented and incomplete. A comprehensive key to the speci...
Dennstaedtia dissecta is recorded for the first time for the Argentinean flora in the Misiones Provin-ce. This new record was discovered during the study of herbarium specimens from BA and LP, and then corroborated with field collections from Cruce Caballero Provincial Park and Urugua-í Provincial Park. In addition to the characteristics of rhizome...
Epiphyte ferns on Alsophila setosa (Cyatheaceae, Pteridophyta) from Misiones province,
Argentina. Trunks of tree ferns offer especially distinctive substrates to support epiphytes. In this paper,
ferns that grow on Alsophila setosa Kaulf. from Misiones were studied. A total of 21 species, from 10
genera and 5 families, were recorded. Polypodiaceae...
Asplenium uniseriale (Aspleniaceae): a new record for the Argentina flora and news about
their habit. Asplenium uniseriale Raddi is recorded for the first time for Argentina. It was collected in
Moconá Provincial Park (Misiones), therefore extending its range southward. The novelty of its epiphytic
habit on the tree fern Alsophila setosa Kaulf r...
Diversity of ferns and lycophytes from 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 envi...
