<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0034-7744</journal-id>
<journal-title><![CDATA[Revista de Biología Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. biol. trop]]></abbrev-journal-title>
<issn>0034-7744</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-77442025000100015</article-id>
<article-id pub-id-type="doi">10.15517/rev.biol.trop..v73i1.61113</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Esporogénesis y ultraestructura de las esporas del helecho Anemia hirsuta (Anemiaceae)]]></article-title>
<article-title xml:lang="en"><![CDATA[Sporogenesis and ultrastructure of spores in the fern Anemia hirsuta (Anemiaceae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rincón-Barón]]></surname>
<given-names><![CDATA[Edgar-Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santos-Heredia]]></surname>
<given-names><![CDATA[Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres-Rodríguez]]></surname>
<given-names><![CDATA[Gerardo-Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Passarelli]]></surname>
<given-names><![CDATA[Lilian-M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Santander Facultad de Ciencias Exactas, Naturales y Agropecuarias Grupo de Investigación en Ciencias Básicas y Aplicadas para la Sostenibilidad-CIBAS]]></institution>
<addr-line><![CDATA[ Bucaramanga]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad del Cauca Unidad de Microscopía Electrónica ]]></institution>
<addr-line><![CDATA[ Cauca]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional de la Plata Facultad de Ciencias Naturales y Museo de La Plata Laboratorio de Estudios de Anatomía Vegetal Evolutiva y Sistemática (LEAVES)]]></institution>
<addr-line><![CDATA[ La Plata]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2025</year>
</pub-date>
<volume>73</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442025000100015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442025000100015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442025000100015&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  Las investigaciones sobre la ontogenia de los esporangios y esporogénesis de los helechos leptosporangiados son escasas en la literatura científica.  Objectivos:  Describir y analizar la ontogenia de los esporangios, esporogénesis, micromorfología y ultraestructura de las esporas maduras del helecho Anemia hirsuta.  Métodos:  Frondas fértiles de A. hirsuta fueron procesadas de acuerdo con protocolos estándar para la inclusión y corte en parafina y resina. Secciones obtenidas en parafina se tiñeron con safranina-azul de alcian, azul de toluidina y PAS/amidoblack. Las secciones obtenidas en resina fueron teñidas con azul de toluidina. Para descripciones detalladas de los procesos, las muestras fueron preparadas para su observación con microscopía electrónica de barrido (MEB). Las esporas maduras fueron analizadas por dispersión de energías de Rayos-X (XEDS). Se obtuvieron secciones ultrafinas para observación mediante microscopía electrónica de transmisión (MET).  Resultados:  Todo el leptosporangio se forma a partir de una célula basal y una apical derivadas de una sola célula epidérmica de la pinna fértil. Los leptosporangios maduros son globosos, con un anillo subapical, además de un pedicelo corto. Durante el desarrollo, el tapete es inicialmente celular y luego se torna plasmodial. Los esporocitos experimentan división meiótica simultánea para formar tétradas de esporas en disposición tetraédrica. Primero se forma el exosporio, constituido por dos capas, una interna muy delgada y una capa externa gruesa, seguido del endosporio y finalmente el perisporio. Las esporas son triletes y muriformes, con microespinas silíceas simples o ramificadas. El perisporio asociado a los muros y a los surcos muestra ser altamente organizado y con evidentes diferencias ultraestructurales.  Conclusiones:  La ontogenia de los esporangios y esporogénesis de A. hirsuta es similar al descrito previamente para helechos leptosporangiados, y a lo registrado en algunas especies fósiles relacionadas. El perisporio es altamente estructurado y organizado. Se registra por primera vez en este grupo, alto contenido de sílice en las microespinas presentes en la esporodermis.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  Research into the ontogeny of sporangia and sporogenesis of leptosporangiate ferns is scarce in the scientific literature.  Objectives:  To describe and analyze the ontogeny of sporangia, sporogenesis, micromorphology, and ultrastructure of mature spores of the fern Anemia hirsuta.  Methods:  Fertile fronds of A. hirsuta were processed according to standard protocols for sectioning and embedding samples in paraffin and resin. Sections in paraffin were stained with safranin-alcian blue, Toluidine Blue, and PAS/amidoblack. Sections in resin were stained with Toluidine Blue. The samples were prepared for observation under scanning electron microscopy (SEM) to yield detailed descriptions. Mature spores were analyzed by X-ray energy dispersion (XEDS). Ultrathin sections were obtained for transmission electron microscopy (TEM) observation.  Results:  The entire leptosporangium is formed from a basal and an apical cell derived from a single epidermal cell of the fertile pinna. The mature leptosporangia are globose, with a subapical ring and a short pedicel. During development, the tapetum is initially cellular, and then becomes plasmodial. The sporocytes undergo simultaneous meiotic division to form tetrads of spores in a tetrahedral arrangement. The exospore is formed first, with two layers, a very thin internal layer and a thick outer layer, followed by the endospore, and finally the perispore. The spores are trilete and muriform, with simple or branched siliceous microspines. The perispore associated with the muri and grooves appears to be highly organized with evident ultrastructural differences.  Conclusions:  The ontogeny of the sporangia and sporogenesis of A. hirsuta is similar to that previously described for leptosporangiate ferns and recorded in some related fossil species. The highly structured and organized perispore is observed. A high silica content in the microspines of the sporodermis is herein reported for the first time in this group.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Anemiaceae]]></kwd>
<kwd lng="en"><![CDATA[sporogenesis]]></kwd>
<kwd lng="en"><![CDATA[sporocytes]]></kwd>
<kwd lng="en"><![CDATA[sporodermis]]></kwd>
<kwd lng="en"><![CDATA[tapetum]]></kwd>
<kwd lng="en"><![CDATA[ultrastructure.]]></kwd>
<kwd lng="es"><![CDATA[Anemiaceae]]></kwd>
<kwd lng="es"><![CDATA[esporogénesis]]></kwd>
<kwd lng="es"><![CDATA[esporocitos]]></kwd>
<kwd lng="es"><![CDATA[esporodermis]]></kwd>
<kwd lng="es"><![CDATA[tapetum]]></kwd>
<kwd lng="es"><![CDATA[ultraestructura.]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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