<?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>2007-4298</journal-id>
<journal-title><![CDATA[Botanical Sciences]]></journal-title>
<abbrev-journal-title><![CDATA[Bot. sci]]></abbrev-journal-title>
<issn>2007-4298</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Botánica de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-42982021000100161</article-id>
<article-id pub-id-type="doi">10.17129/botsci.2667</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Description and distribution of Nemacystus howei (W.R. Taylor) Kylin (Chordariaceae) from the northern coast of the Yucatán peninsula]]></article-title>
<article-title xml:lang="es"><![CDATA[Descripción y distribución de Nemacystus howei (W.R. Taylor) Kylin (Chordariaceae) en la costa norte de la península de Yucatán]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortegon-Aznar]]></surname>
<given-names><![CDATA[Ileana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Suárez]]></surname>
<given-names><![CDATA[Ana M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galindo-de Santiago]]></surname>
<given-names><![CDATA[María del Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Wynne]]></surname>
<given-names><![CDATA[Michael J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Yucatán Departamento de Biología Marina ]]></institution>
<addr-line><![CDATA[Mérida Yucatán]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de La Habana Centro de Investigaciones Marinas ]]></institution>
<addr-line><![CDATA[ La Habana]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias UMDI-Sisal]]></institution>
<addr-line><![CDATA[ Yucatán]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,University of Michigan Department of Ecology and Evolutionary Biology and Herbarium ]]></institution>
<addr-line><![CDATA[Ann Arbor MI]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<volume>99</volume>
<numero>1</numero>
<fpage>161</fpage>
<lpage>168</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982021000100161&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982021000100161&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982021000100161&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: There are few studies about Nemacystus on the Atlantic coast, and N. howei has been reported only once for Mexico; that record, however, did not provide a description of this species.  Question:  What are the morphological characteristics of Nemacystus howei and its distribution on the Yucatan coast?  Species study:  Macroalgae, Phaeophyceae, Nemacystus howei.  Study site and year of study:  North coast of Yucatán Peninsula of Mexico. Dry and rainy seasons from 2017 to 2019.  Methods:  Sampling was carried out at five localities, at 5 and 10 m depths, with scuba equipment. Specimens were preserved in diluted formalin in sea water; silica gel and dried-pressed vouchers are housed at the UADY  Results:  Six samples were collected at the five localities. Each one contains a small mass of filamentous of specimens of Nemacystus howei, that were found only during dry season, at both depths sampled. This alga has a thallus of an entangled filamentous mass of cylindrical, mucilaginous axes, of a light brown color. Younger branches have a solid central axis. Branching is abundant. The main, older axes are hollow. The assimilatory filaments are branched a few times, producing uniseriate colorless hairs and with plurilocular sporangia arising from the base. Nemacystus howei is easily confused with Cladosiphon occidentalis Kylin due to their similar morphology, branching pattern, and size.  Conclusion:  The significant morphological similarities between these species as well as the paucity of specific works on the Phaeophyceae of the Yucatan Peninsula may explain why Nemacystus howei had not been previously reported.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: Nemacystus es un género poco estudiado y N. howei solo se ha reportado una vez para México, sin una descripción de esta especie.  Pregunta:  ¿Cuáles son las características morfológicas de Nemacystus howei y su distribución en la costa de Yucatán?  Especie de estudio:  Macroalgas, Phaeophyceae, Nemacystus howei.  Sitio y años de estudio:  Costa norte de la península de Yucatán. Temporadas de secas y lluvias, de 2017 a 2019.  Métodos:  Se muestrearon 5 sitios a lo largo de la costa a 5 y 10 metros de profundidad, con equipo de buceo autónomo. Los especímenes se conservaron en formalina al 4 %, sílica gel y en cartulina y se depositaron en el herbario de la UADY Mérida.  Resultados:  Se colectaron 6 muestras en cinco localidades cada una contenía unos filamentos de especímenes de Nemacystus howei. Solo se encontró durante la época de seca, a ambas profundidades. Se presenta como una masa de filamentos cilíndricos, y mucilaginosos, de color café claro. Los ejes principales son huecos y las ramas juveniles tienen eje central sólido. La ramificación es abundante. Los filamentos asimiladores son poco ramificados, producen pelos incoloros uniseriados y la esporangia plurilocular surge de su base. Nemacystus howei, se confunde fácilmente con Cladosiphon occidentalis Kylin, debido a su morfología, patrón de ramificación y tamaño similares.  Conclusión:  Se considera que, por la gran similitud morfológica con C. occidentalis y la falta de trabajos especializados sobre el grupo Phaeophyceae, es posible que por ello no se había reportado anteriormente para la Península de Yucatán.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Cladosiphon]]></kwd>
<kwd lng="en"><![CDATA[Gulf of Mexico]]></kwd>
<kwd lng="en"><![CDATA[morphology]]></kwd>
<kwd lng="en"><![CDATA[Phaeophyceae]]></kwd>
<kwd lng="es"><![CDATA[Cladosiphon]]></kwd>
<kwd lng="es"><![CDATA[Golfo de México]]></kwd>
<kwd lng="es"><![CDATA[morfología]]></kwd>
<kwd lng="es"><![CDATA[Phaeophyceae]]></kwd>
</kwd-group>
</article-meta>
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