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<mods:title id="47F03624FDAE8E631A2B4DBB30E07DD9">Morpho-anatomical study of Sargassum (Fucales, Phaeophyceae) diversity reveals noteworthy collections and range extensions from southwestern Vietnam</mods:title>
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<mods:namePart id="78CCE3EBD7C0A04513BF1CF3B3ACF06D">Tu, Nguyen Van</mods:namePart>
<mods:affiliation id="B314742505DBA66BD7C156AD0812C8FC">Department of Ecology, Institute of Tropical Biology, Vietnam Academy of Science and Technology, 85 Tran Quoc Toan Street, District 3, Hochiminh city 70000, Vietnam &amp; Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay District, Ha Noi 122100, Vietnam</mods:affiliation>
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<mods:title id="60419D915F8C45114D88CA4A627CF55D">Phytotaxa</mods:title>
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<mods:date id="5BE267F8672EE8FF473B872360E13E57">2023</mods:date>
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<treatmentCitation id="C47F0A271C306857FF36FF561DD6FF22" author="Agardh, J. G." box="[136,671,157,184]" page=")" pageId="5" pageNumber="286" year="1848">
<taxonomicName id="82DE57B51C306857FF36FF561DD6FF22" authority="J. Agardh (1848: 323)" authorityName="J. Agardh. A. Habit" authorityPageNumber="323" authorityYear="1848" box="[136,671,157,184]" class="Phaeophyceae" family="Sargassaceae" genus="Sargassum" kingdom="Chromista" order="Fucales" pageId="5" pageNumber="286" phylum="Ochrophyta" rank="species" species="microcystum">
<emphasis id="77AAF0241C306857FF36FF561D51FF2D" bold="true" box="[136,536,157,184]" pageId="5" pageNumber="286">
<emphasis id="77AAF0241C306857FF36FF561EEBFF22" bold="true" box="[136,418,158,184]" italics="true" pageId="5" pageNumber="286">Sargassum microcystum</emphasis>
J.
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</emphasis>
(1848: 323)
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(
<figureCitation id="DDE530B31C306857FD10FF561C68FF23" box="[686,801,158,185]" captionStart="FIGURE 5" captionStartId="5.[136,229,1359,1381]" captionTargetBox="[195,1399,474,1319]" captionTargetId="figure-125@5.[151,1436,461,1335]" captionTargetPageId="5" captionText="FIGURE 5. Sargassum microcystum J.Agardh.A. Habit of a voucher specimen (NVT2468).B. Holdfast.C.Leaves.D.Vesicles.E. Receptacles. F. Section of female receptacle." figureDoi="http://doi.org/10.5281/zenodo.8129390" httpUri="https://zenodo.org/record/8129390/files/figure.png" pageId="5" pageNumber="286">Fig. 5AF</figureCitation>
)
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<paragraph id="45612C361C306857FF36FF2E1B16FE2E" blockId="5.[136,1452,230,437]" pageId="5" pageNumber="286">
Thallus
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high or more, attached by a discoidal to conical shaped holdfast, warty, up to
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in diameter. Main axes cylindrical, up to
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long, producing 35 primary branches. Primary branches cylindrical or somewhat compressed at lower part, smooth,
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in diameter. Lateral branches coarse. Leaves thick, crisp, lanceolate, with short petioles, obtuse to round at the apex, with irregularly denticulate margin. Midrib inconspicuous, vanishing to the apex,
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long and up to
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wide. Cryptostomata conspicuous, scattered over leaf surface. Vesicles numerous,
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long, spherical to obovate, bearing a fine spine or dentate wing.
</paragraph>
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<emphasis id="77AAF0241C306857FF36FA871FBFFAFE" bold="true" box="[136,246,1359,1381]" pageId="5" pageNumber="286">FIGURE 5</emphasis>
.
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<emphasis id="77AAF0241C306857FEBFFA981EA8FAFF" box="[257,481,1360,1381]" italics="true" pageId="5" pageNumber="286">Sargassum microcystum</emphasis>
J.Agardh.A. Habit
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of a voucher specimen (NVT2468). B. Holdfast. C. Leaves. D. Vesicles. E. Receptacles. F. Section of female receptacle.
</paragraph>
</caption>
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Plant dioecious. Receptacles in racemose branchlets. Male receptacles cylindrical, about
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long and
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wide. Females receptacles triquetrous, about
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long and
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wide. Maturation in spring in the southwestern
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.
</paragraph>
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<emphasis id="77AAF0241C306857FF03F9EB1E50F9A7" bold="true" box="[189,281,1571,1597]" pageId="5" pageNumber="286">Habitat</emphasis>
:—
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<emphasis id="77AAF0241C306857FE83F9EC1D0EF9A7" box="[317,583,1572,1598]" italics="true" pageId="5" pageNumber="286">Sargassum microcystum</emphasis>
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grows on rock and dead coral in the lower intertidal to subtidal zone.
</paragraph>
<paragraph id="45612C361C306857FF03F98F1B37F91C" blockId="5.[136,1452,1463,1886]" pageId="5" pageNumber="286">
<emphasis id="77AAF0241C306857FF03F98F1EFAF9FB" bold="true" box="[189,435,1607,1633]" pageId="5" pageNumber="286">Specimens examined</emphasis>
:—
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Ganh Dau, Phu Quoc, subtidal,
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<collectingDate id="2124F31E1C306857FC9DF98F1CE6F9F8" box="[803,943,1607,1634]" pageId="5" pageNumber="286" value="2019-02-15">15 Feb. 2019</collectingDate>
</date>
,
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<collectionCode id="23CFB4F31C306857FC09F9801C81F9FB" box="[951,968,1608,1633]" country="Canada" lsid="urn:lsid:biocol.org:col:13946" name="Royal British Columbia Museum - Herbarium" pageId="5" pageNumber="286" type="Museum">V</collectionCode>
.
<collectionCode id="23CFB4F31C306857FC75F9801C92F9FB" box="[971,987,1608,1633]" name="Tavera, Department of Geology and Geophysics" pageId="5" pageNumber="286">T</collectionCode>
</emphasis>
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<emphasis id="77AAF0241C306857FC65F9801C96F9FB" box="[987,991,1608,1633]" italics="true" pageId="5" pageNumber="286">.</emphasis>
<materialsCitation id="F5B6266B1C306857FC5DF9801CDAF91F" collectingDate="2019-02-16" collectionCode="V, T" pageId="5" pageNumber="286" specimenCode="NVT2468, NVT2469, NVT2471, NVT2492, NVT2493" specimenCount="1">
<emphasis id="77AAF0241C306857FC5DF9801B7FF9FB" box="[995,1078,1608,1633]" italics="true" pageId="5" pageNumber="286">Nguyen</emphasis>
(
<specimenCode id="1578844D1C306857FBFCF98F1BFDF9FB" box="[1090,1204,1607,1633]" collectionCode="NVT" pageId="5" pageNumber="286">NVT2468</specimenCode>
,
<specimenCode id="1578844D1C306857FB03F98F1A64F9FB" box="[1213,1325,1607,1633]" collectionCode="NVT" pageId="5" pageNumber="286">NVT2469</specimenCode>
,
<specimenCode id="1578844D1C306857FA88F9801AE1F9F8" box="[1334,1448,1608,1634]" collectionCode="NVT" pageId="5" pageNumber="286">NVT2471</specimenCode>
,
<specimenCode id="1578844D1C306857FF36F9A41FB0F91C" box="[136,249,1644,1670]" collectionCode="NVT" pageId="5" pageNumber="286">NVT2492</specimenCode>
,
<specimenCode id="1578844D1C306857FEBAF9A41E3FF91C" box="[260,374,1644,1670]" collectionCode="NVT" pageId="5" pageNumber="286">NVT2493</specimenCode>
), Duong Dong, lower intertidal,
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<collectingDate id="2124F31E1C306857FD6AF9A31C2DF91C" box="[724,868,1643,1670]" pageId="5" pageNumber="286" value="2019-02-16">16 Feb. 2019</collectingDate>
</date>
,
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<collectionCode id="23CFB4F31C306857FCD1F9A41CC9F91F" box="[879,896,1644,1669]" country="Canada" lsid="urn:lsid:biocol.org:col:13946" name="Royal British Columbia Museum - Herbarium" pageId="5" pageNumber="286" type="Museum">V</collectionCode>
.
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</emphasis>
</materialsCitation>
<emphasis id="77AAF0241C306857FC2DF9A41CDEF91F" box="[915,919,1644,1669]" italics="true" pageId="5" pageNumber="286">.</emphasis>
<materialsCitation id="F5B6266B1C306857FC22F9A41B33F91C" box="[924,1146,1643,1670]" collectionCode="NVT" pageId="5" pageNumber="286" specimenCode="NVT2517" specimenCount="1">
<emphasis id="77AAF0241C306857FC22F9A41CA6F91F" box="[924,1007,1644,1669]" italics="true" pageId="5" pageNumber="286">Nguyen</emphasis>
(
<specimenCode id="1578844D1C306857FC43F9A31B3BF91C" box="[1021,1138,1643,1670]" collectionCode="NVT" pageId="5" pageNumber="286">NVT2517</specimenCode>
)
</materialsCitation>
.
</paragraph>
<paragraph id="45612C361C306857FF03F9471C4FF8C7" blockId="5.[136,1452,1463,1886]" pageId="5" pageNumber="286">
<emphasis id="77AAF0241C306857FF03F9471EFBF930" bold="true" box="[189,434,1679,1706]" pageId="5" pageNumber="286">Taxonomic remarks</emphasis>
:—
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<emphasis id="77AAF0241C306857FE6AF9581D96F933" box="[468,735,1680,1706]" italics="true" pageId="5" pageNumber="286">Sargassum microcystum</emphasis>
</taxonomicName>
is distinguished from other species by having numerous small vesicles without rhizoids and secondary axes that are smooth and somewhat compressed on the lower parts. The
<typeStatus id="9A6592941C306857FAEBF97C1AE5F954" box="[1365,1452,1716,1742]" pageId="5" pageNumber="286">syntype</typeStatus>
localities are “marfi Indico”,
<collectingCountry id="3DC96CA61C306857FE73F91F1D73F96B" box="[461,570,1751,1777]" name="Indonesia" pageId="5" pageNumber="286">Moluccas</collectingCountry>
in
<collectingCountry id="3DC96CA61C306857FDE3F91F1D84F96B" box="[605,717,1751,1777]" name="Indonesia" pageId="5" pageNumber="286">Indonesia</collectingCountry>
,
<collectingRegion id="871AE2D41C306857FD69F91F1C6FF96B" box="[727,806,1751,1777]" country="Philippines" name="Manila" pageId="5" pageNumber="286">Manila</collectingRegion>
in the
<collectingCountry id="3DC96CA61C306857FCCFF91F1CBBF96B" box="[881,1010,1751,1777]" name="Philippines" pageId="5" pageNumber="286">Philippines</collectingCountry>
, and
<collectingCountry id="3DC96CA61C306857FB92F91F1BD7F96B" box="[1068,1182,1751,1777]" name="Singapore" pageId="5" pageNumber="286">Singapore</collectingCountry>
(
<bibRefCitation id="214F51C71C306857FB15F91F1AD6F968" author="Silva, P. C. &amp; Basson, P. W. &amp; Moe, R. L." box="[1195,1439,1751,1778]" pageId="5" pageNumber="286" 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="77AAF0241C306857FB53F9101A6CF96B" box="[1261,1317,1751,1777]" italics="true" pageId="5" pageNumber="286">et al.</emphasis>
1996: 685
</bibRefCitation>
).
<bibRefCitation id="214F51C71C306857FF36F9331E6BF88C" author="Yendo, K." box="[136,290,1787,1814]" pageId="5" pageNumber="286" pagination="1 - 174" refId="ref6681" refString="Yendo, K. (1907) The Fucaceae of Japan. Journal of College of Science, Imperial University of Tokyo 21: 1 - 174." type="journal article" year="1907">Yendo (1907)</bibRefCitation>
described leaves of
<taxonomicName id="82DE57B51C306857FDB4F9341DFCF88F" authorityName="J. Agardh. A. Habit" authorityYear="1848" box="[522,693,1788,1814]" class="Phaeophyceae" family="Sargassaceae" genus="Sargassum" kingdom="Chromista" order="Fucales" pageId="5" pageNumber="286" phylum="Ochrophyta" rank="species" species="microcystum">
<emphasis id="77AAF0241C306857FDB4F9341DFCF88F" box="[522,693,1788,1814]" italics="true" pageId="5" pageNumber="286">S. microcystum</emphasis>
</taxonomicName>
as being narrow; however, specimens from Phu Quoc have typical lanceolate leaves, and basal leaves are ovate and longer than upper ones, as described by
<bibRefCitation id="214F51C71C306857FBD6F8D71BB5F8A3" author="Pham, H. H." box="[1128,1276,1823,1849]" pageId="5" pageNumber="286" pagination="259 - 332" refId="ref6336" refString="Pham, H. H. (1967) Contribution a lʹetude des algues littorales du Vietnam: le genre Sargassum. Annales de la Faculte des Sciences de Saigon 1967: 259 - 332." type="journal article" year="1967">Pham (1967)</bibRefCitation>
. Cryptostomata are conspicuous, a feature not described by
<bibRefCitation id="214F51C71C306857FDD3F88B1C48F8C7" author="Pham, H. H." box="[621,769,1859,1885]" pageId="5" pageNumber="286" pagination="259 - 332" refId="ref6336" refString="Pham, H. H. (1967) Contribution a lʹetude des algues littorales du Vietnam: le genre Sargassum. Annales de la Faculte des Sciences de Saigon 1967: 259 - 332." type="journal article" year="1967">Pham (1967)</bibRefCitation>
.
</paragraph>
</subSubSection>
</treatment>
</document>