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<mods:title id="892F5CA8BA18DD0099C2F1380BB9BB51">Morpho-anatomical study of Sargassum (Fucales, Phaeophyceae) diversity reveals noteworthy collections and range extensions from southwestern Vietnam</mods:title>
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<taxonomicName id="82DE57B51C306857FF36F8431DC0F83F" authority="J. Agardh (1848: 316)" authorityName="J. Agardh. A. Habit" authorityPageNumber="316" authorityYear="1848" box="[136,649,1931,1958]" class="Phaeophyceae" family="Sargassaceae" genus="Sargassum" kingdom="Chromista" order="Fucales" pageId="5" pageNumber="286" phylum="Ochrophyta" rank="species" species="siliquosum">
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<emphasis id="77AAF0241C306857FF36F8431EC5F83C" bold="true" box="[136,396,1931,1958]" italics="true" pageId="5" pageNumber="286">Sargassum siliquosum</emphasis>
J.
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(1848: 316)
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(
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)
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</paragraph>
<paragraph id="45612C361C306854FF36F81B1E80FEBF" blockId="5.[136,1451,2003,2066]" lastBlockId="6.[136,1452,158,725]" lastPageId="6" lastPageNumber="287" pageId="5" pageNumber="286">
Thallus up to
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high, attached by discoidal holdfast,
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in diameter. Main axes terete, smooth,
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wide, producing 35 primary branches. Primary branches cylindrical, smooth, terete
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at base. Lateral branches numerous, alternate at an interval of
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. Basal leaves thick, large, oval, 2.55.0 cm long, 0.31.0 cm wide; upper leaves
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long and up to
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wide, with shallowly dentate margin. Midrip conspicuous but fading towards the apex. Cryptostomata irregularly scattered. Vesicles oval or lanceolate, about
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long and up to
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wide, with very short flat petioles, mucronate.
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Plant monoecious. Receptacles cylindrical, smooth, simple to once furcate, about
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long or more. Maturation in spring in the southwestern
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.
</paragraph>
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<emphasis id="77AAF0241C336854FF03FEBE1E50FE0A" bold="true" box="[189,281,374,400]" pageId="6" pageNumber="287">Habitat</emphasis>
:—
<taxonomicName id="82DE57B51C336854FE83FEBF1D7BFE0A" authorityName="J. Agardh. A. Habit" authorityYear="1848" box="[317,562,374,401]" class="Phaeophyceae" family="Sargassaceae" genus="Sargassum" kingdom="Chromista" order="Fucales" pageId="6" pageNumber="287" phylum="Ochrophyta" rank="species" species="siliquosum">
<emphasis id="77AAF0241C336854FE83FEBF1D7BFE0A" box="[317,562,374,401]" italics="true" pageId="6" pageNumber="287">Sargassum siliquosum</emphasis>
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grows on rock and dead coral in the lower intertidal zone.
</paragraph>
<paragraph id="45612C361C336854FF03FE521BB1FE43" blockId="6.[136,1452,158,725]" pageId="6" pageNumber="287">
<emphasis id="77AAF0241C336854FF03FE521EFCFE2E" bold="true" box="[189,437,410,436]" pageId="6" pageNumber="287">Specimens examined</emphasis>
:—
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<collectorName id="E82B49E01C336854FE68FE531D21FE2F" box="[470,616,411,437]" pageId="6" pageNumber="287">Duong Dong</collectorName>
,
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, lower intertidal,
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<collectingDate id="2124F31E1C336854FC20FE521B67FE2E" box="[926,1070,410,437]" pageId="6" pageNumber="287" value="2018-03-01">01 Mar. 2018</collectingDate>
</date>
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.
<collectionCode id="23CFB4F31C336854FBF7FE531B10FE2E" box="[1097,1113,411,436]" name="Tavera, Department of Geology and Geophysics" pageId="6" pageNumber="287">T</collectionCode>
</emphasis>
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<emphasis id="77AAF0241C336854FBE7FE531B14FE2E" box="[1113,1117,411,436]" italics="true" pageId="6" pageNumber="287">.</emphasis>
<materialsCitation id="F5B6266B1C336854FBDDFE531CDAFE42" collectingDate="2019-02-16" collectionCode="V, T" collectorName="Nguyen, S. M &amp; Duong Dong" pageId="6" pageNumber="287" specimenCode="NVT2043, NVT2044, NVT2045" specimenCount="1">
<emphasis id="77AAF0241C336854FBDDFE531A6EFE2E" box="[1123,1319,411,437]" italics="true" pageId="6" pageNumber="287">
<collectorName id="E82B49E01C336854FBDDFE531BA7FE2E" box="[1123,1262,411,437]" pageId="6" pageNumber="287">Nguyen, S.M</collectorName>
. Boo
</emphasis>
(
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,
<specimenCode id="1578844D1C336854FF36FE761FB0FE42" box="[136,249,446,472]" collectionCode="NVT" pageId="6" pageNumber="287">NVT2044</specimenCode>
,
<specimenCode id="1578844D1C336854FEBAFE761E3FFE43" box="[260,374,446,473]" collectionCode="NVT" pageId="6" pageNumber="287">NVT2045</specimenCode>
),
<collectorName id="E82B49E01C336854FE36FE771D5EFE43" box="[392,535,447,473]" pageId="6" pageNumber="287">Duong Dong</collectorName>
, lower intertidal,
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<collectingDate id="2124F31E1C336854FD6AFE761C2DFE42" box="[724,868,446,472]" pageId="6" pageNumber="287" value="2019-02-16">16 Feb. 2019</collectingDate>
</date>
,
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<collectionCode id="23CFB4F31C336854FCD1FE771CC9FE42" box="[879,896,447,472]" country="Canada" lsid="urn:lsid:biocol.org:col:13946" name="Royal British Columbia Museum - Herbarium" pageId="6" pageNumber="287" type="Museum">V</collectionCode>
.
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</emphasis>
</materialsCitation>
<emphasis id="77AAF0241C336854FC2DFE771CDEFE42" box="[915,919,447,472]" italics="true" pageId="6" pageNumber="287">.</emphasis>
<materialsCitation id="F5B6266B1C336854FC22FE771BBDFE43" box="[924,1268,446,473]" collectionCode="NVT" collectorName="Nguyen" pageId="6" pageNumber="287" specimenCode="NVT2510, NVT2511" specimenCount="1">
<emphasis id="77AAF0241C336854FC22FE771CA6FE42" box="[924,1007,447,472]" italics="true" pageId="6" pageNumber="287">
<collectorName id="E82B49E01C336854FC22FE771CA6FE42" box="[924,1007,447,472]" pageId="6" pageNumber="287">Nguyen</collectorName>
</emphasis>
(
<specimenCode id="1578844D1C336854FC43FE761B26FE43" box="[1021,1135,446,473]" collectionCode="NVT" pageId="6" pageNumber="287">NVT2510</specimenCode>
,
<specimenCode id="1578844D1C336854FBC4FE761BA5FE43" box="[1146,1260,446,473]" collectionCode="NVT" pageId="6" pageNumber="287">NVT2511</specimenCode>
)
</materialsCitation>
.
</paragraph>
<paragraph id="45612C361C336854FF03FE2A1E46FD4E" blockId="6.[136,1452,158,725]" pageId="6" pageNumber="287">
<emphasis id="77AAF0241C336854FF03FE2A1EF5FE66" bold="true" box="[189,444,482,508]" pageId="6" pageNumber="287">Taxonomic remarks:</emphasis>
<taxonomicName id="82DE57B51C336854FE69FE2B1D9AFE66" authorityName="J. Agardh. A. Habit" authorityYear="1848" box="[471,723,482,509]" class="Phaeophyceae" family="Sargassaceae" genus="Sargassum" kingdom="Chromista" order="Fucales" pageId="6" pageNumber="287" phylum="Ochrophyta" rank="species" species="siliquosum">
<emphasis id="77AAF0241C336854FE69FE2B1D9AFE66" box="[471,723,482,509]" italics="true" pageId="6" pageNumber="287">Sargassum siliquosum</emphasis>
</taxonomicName>
is distinguished from other species by having numerous small vesicles, secondary axis somewhat compressed and smooth at lower part. The
<typeStatus id="9A6592941C336854FC68FDCF1B63FDBB" box="[982,1066,519,545]" pageId="6" pageNumber="287">syntype</typeStatus>
localities of this species are
<collectingRegion id="871AE2D41C336854FAE1FDCE1AE5FDBA" box="[1375,1452,518,544]" country="Indonesia" name="Jakarta Raya" pageId="6" pageNumber="287">Jakarta</collectingRegion>
in
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and
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(
<bibRefCitation id="214F51C71C336854FE74FDE21DC0FDDE" author="Silva, P. C. &amp; Basson, P. W. &amp; Moe, R. L." box="[458,649,554,580]" pageId="6" pageNumber="287" pagination="1 - 1259" refId="ref6428" refString="Silva, P. C., Basson, P. W. &amp; Moe, R. L. (1996) Catalogue of the benthic marine algae of the Indian Ocean. University of California Publications in Botany 79: 1 - 1259." type="journal article" year="1996">
Silva
<emphasis id="77AAF0241C336854FDB2FDE31D0FFDDE" box="[524,582,554,580]" italics="true" pageId="6" pageNumber="287">et al.</emphasis>
1996
</bibRefCitation>
). The cylindrical and warty axes described by
<bibRefCitation id="214F51C71C336854FB26FDE31A09FDDE" author="Nguyen, H. D." box="[1176,1344,554,581]" pageId="6" pageNumber="287" refId="ref6003" refString="Nguyen, H. D. (2007) Flora of Vietnam. Science and Technology Publishing House, Hanoi, 117 pp." type="book" year="2007">Nguyen (2007)</bibRefCitation>
were not observed in specimens from the Phu Quoc Island. Primary branches are terete,
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at base, basal leaves are longer and bigger than those positioned at the lateral branches. Leaves of Vietnamese specimens are shorter than those from
<collectingCountry id="3DC96CA61C336854FAD4FDBA1AE2FD16" box="[1386,1451,626,652]" name="China" pageId="6" pageNumber="287">China</collectingCountry>
(
<bibRefCitation id="214F51C71C336854FF31FD5E1E1BFD2A" author="Tseng, C. K. &amp; Lu Baoren" box="[143,338,662,689]" pageId="6" pageNumber="287" refId="ref6504" refString="Tseng, C. K. &amp; Lu Baoren (1992). Studies on the malacocarpic Sargassum of China II. Racemosae J. Agardh. In: Abbott, I. A. (Ed.) Taxonomy of economic seaweeds with reference to some Pacific species. Vol. 3. California Sea Grant College Program, La Jolla, CA. pp. 11 - 34." type="book" year="1992">Tseng &amp; Lu 1992</bibRefCitation>
). Vesicles are oval to lanceolate, sharply pointed or rounded,
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in length, as Chinese plants (
<bibRefCitation id="214F51C71C336854FAD7FD5E1E4DFD4E" author="Tseng, C. K. &amp; Lu Baoren" pageId="6" pageNumber="287" refId="ref6504" refString="Tseng, C. K. &amp; Lu Baoren (1992). Studies on the malacocarpic Sargassum of China II. Racemosae J. Agardh. In: Abbott, I. A. (Ed.) Taxonomy of economic seaweeds with reference to some Pacific species. Vol. 3. California Sea Grant College Program, La Jolla, CA. pp. 11 - 34." type="book" year="1992">Tseng &amp; Lu 1992</bibRefCitation>
).
</paragraph>
<caption id="11A17CBE1C336854FF36FA2C1E2CF984" ID-DOI="http://doi.org/10.5281/zenodo.8129392" ID-Zenodo-Dep="8129392" httpUri="https://zenodo.org/record/8129392/files/figure.png" pageId="6" pageNumber="287" startId="6.[136,229,1508,1530]" targetBox="[154,1405,779,1457]" targetPageId="6" targetType="figure">
<paragraph id="45612C361C336854FF36FA2C1E2CF984" blockId="6.[136,1453,1508,1566]" pageId="6" pageNumber="287">
<emphasis id="77AAF0241C336854FF36FA2C1FBEFA63" bold="true" box="[136,247,1508,1530]" pageId="6" pageNumber="287">FIGURE 6</emphasis>
.
<taxonomicName id="82DE57B51C336854FEBDFA2C1DCBFA60" authority="J. Agardh. A. Habit" authorityName="J. Agardh. A. Habit" authorityYear="1848" box="[259,642,1508,1530]" class="Phaeophyceae" family="Sargassaceae" genus="Sargassum" kingdom="Chromista" order="Fucales" pageId="6" pageNumber="287" phylum="Ochrophyta" rank="species" species="siliquosum">
<emphasis id="77AAF0241C336854FEBDFA2C1E9BFA63" box="[259,466,1508,1529]" italics="true" pageId="6" pageNumber="287">Sargassum siliquosum</emphasis>
J.Agardh. A. Habit
</taxonomicName>
of a voucher specimen (NVT2044). B. Holdfast. C. Leaves. D. Vesicles. E. Receptacles. F. Section of receptacle.
</paragraph>
</caption>
<paragraph id="45612C361C336854FF03F9841BE4F96C" blockId="6.[136,1452,1612,1783]" pageId="6" pageNumber="287">
<emphasis id="77AAF0241C336854FF03F9841C0EF9FC" bold="true" box="[189,839,1612,1638]" pageId="6" pageNumber="287">
Identification of species from southwestern
<collectingCountry id="3DC96CA61C336854FD5FF9841C0EF9FC" box="[737,839,1612,1638]" name="Vietnam" pageId="6" pageNumber="287">Vietnam</collectingCountry>
</emphasis>
: In the present study, eleven species of
<taxonomicName id="82DE57B51C336854FA8FF9851AE2F9FD" authorityName="C. Agardh" authorityYear="1820" box="[1329,1451,1613,1639]" class="Phaeophyceae" family="Sargassaceae" genus="Sargassum" kingdom="Chromista" order="Fucales" pageId="6" pageNumber="287" phylum="Ochrophyta" rank="genus">
<emphasis id="77AAF0241C336854FA8FF9851AE2F9FD" box="[1329,1451,1613,1639]" italics="true" pageId="6" pageNumber="287">Sargassum</emphasis>
</taxonomicName>
including five species described above were collected and examined (Table S1). Six species commonly occur along the east coast of Vietnam, and their morphologies and descriptions have been introduced by my thesis and other reports (
<bibRefCitation id="214F51C71C336854FF31F9701E5AF948" author="Pham, H. H." box="[143,275,1720,1746]" pageId="6" pageNumber="287" refId="ref6372" refString="Pham, H. H. (1969) Marine algae of south Vietnam. Sai Gon study Center. Ministry of Education and Youth, 558 pp." type="book" year="1969">Pham 1969</bibRefCitation>
,
<bibRefCitation id="214F51C71C336854FEA3F9711EF1F948" author="Nguyen, H. D." box="[285,440,1720,1747]" pageId="6" pageNumber="287" refId="ref6003" refString="Nguyen, H. D. (2007) Flora of Vietnam. Science and Technology Publishing House, Hanoi, 117 pp." type="book" year="2007">Nguyen 2007</bibRefCitation>
,
<bibRefCitation id="214F51C71C336854FE7CF9711D14F948" author="Nguyen, V. T." box="[450,605,1720,1747]" pageId="6" pageNumber="287" refId="ref6073" refString="Nguyen, V. T. (2014) Seaweed diversity in Vietnam, with an emphasis of the brown algal genus Sargassum. Ph. D. thesis. Ghent University, Ghent, 191 pp." type="book" year="2014">Nguyen 2014</bibRefCitation>
, Nguyen 2020,
<bibRefCitation id="214F51C71C336854FCB2F9711CB3F948" author="Nguyen, V. T. &amp; Boo, S. M." box="[780,1018,1720,1747]" pageId="6" pageNumber="287" pagination="463 - 468" refId="ref6165" refString="Nguyen, V. T. &amp; Boo, S. M. (2020) Distribution patterns and biogeography of Sargassum (Fucales, Phaeophyceae) along the coast of Vietnam. Botanica Marina 63: 463 - 468. https: // doi. org / 10.1515 / bot- 2019 - 0082" type="journal article" year="2020">Nguyen &amp; Boo 2020</bibRefCitation>
). Based on morphological descriptions and illustrations, a key for identification of species from southwestern Vietnam is given below.
</paragraph>
</subSubSection>
</treatment>
</document>