Molecular-assisted taxonomic study on the Sargassum C. Agardh (Fucales, Phaeophyceae) in northwestern Luzon, Philippines Author Santiañez, Wilfred John E. G. T. Velasquez Phycological Herbarium and The Marine Science Institute, College of Science, University of the Philippines Diliman, Quezon City, 1101 (Philippines) wjsantianez@msi.upd.edu.ph Author Lastimoso, John Michael L. G. T. Velasquez Phycological Herbarium and The Marine Science Institute, College of Science, University of the Philippines Diliman, Quezon City, 1101 (Philippines) wjsantianez @ msi. upd. edu. ph (corresponding author) jmlastimoso @ msi. upd. edu. ph jmlastimoso@msi.upd.edu Author Hoshino, Masakazu Department of Natural History Sciences, Graduate School of Science, Hokkaido University, Sapporo, 060 - 0810 (Japan) and Research Center for Inland Seas, Kobe University, Rokkodai 1 - 1, Nadaku, Kobe 657 - 8501 (Japan) mhoshino. sci @ gmail. com sci@gmail.com Author Villafuerte, Brix Nester Q. G. T. Velasquez Phycological Herbarium and The Marine Science Institute, College of Science, University of the Philippines Diliman, Quezon City, 1101 (Philippines) bnvillafuerte @ msi. upd. edu. ph bnvillafuerte@msi.upd.edu Author Kogame, Kazuhiro Department of Biological Sciences, Faculty of Science, Hokkaido University, Sapporo, 060 - 0810 (Japan) kogame @ sci. hokudai. ac. jp kogame@sci.hokudai.ac Author Gavino C. Trono, Jr G. T. Velasquez Phycological Herbarium and The Marine Science Institute, College of Science, University of the Philippines Diliman, Quezon City, 1101 (Philippines) gctrono @ yahoo. com gctrono@yahoo.com text Cryptogamie, Algologie 2023 2023-10-18 20 7 127 142 https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/algologie2023v44a7.pdf journal article 273570 10.5252/cryptogamie-algologie2023v44a7 839c71f5-2ca8-42b4-a930-0341671588ed 1776-0984 10020969 KEY TO THE CONFIRMED SPECIES OF SARGASSUM C. AGARDH IN NORTHWESTERN LUZON , PHILIPPINES 1. Thallus typically with stoloniferous holdfasts; branches terete, usually with numerous branched protuberances; vesicles small, numerous, spherical to ovoid ................................................... Sargassum polycystum C.Agardh — Thallus without stoloniferous holdfasts; branches smooth, terete, slightly compressed, to compressed; vesicles large, globose to obovoid, ribbed, sometimes mucronated ........................................................................... 2 2. Branches smooth and compressed; blades linear-lanceolate to linear oblanceolate, distinctly serrate-dentate; vesicles large, ovoid to obovoid, to 7 mm long ............................... Sargassum aquifolium (Turner) C.Agardh — Branches smooth, terete to slightly compressed; blades highly variable in shape, margins serrate to biserrate, ‘duplicated’ especially towards the apices, duplication sometimes appearing turbinarioid; vesicles globose, to 5.4 mm in diameter ......................................................................... Sargassum ilicifolium (Turner) C.Agardh