Which sargassum specie is this?

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Vijaya Kerkar

close up of receptacle, position of air bladders , branching, leaf margin etc. are required for Identification of Sargassum

Wolfgang Sterrer

There are more than 900 described species of Sargassum world-wide (http://www.marinespecies.org/aphia.php?p=taxdetails&id=144132&allchildren=1).

For identification try AlgaeBase, http://www.algaebase.org/search/genus/detail/?genus_id=77

Good luck!

Geddada Mohan Narasimha Rao

Close up photograph required for proper identification, it may be either S. vulgare or S. tenneramum

Rezzoum Noreddine

I think it's Sargassum vulgare.