Caulerpa racemosa, grape caulerpa.  And of course you mean macroalgae, ie. large. Caulerpas are the largest single celled organisms on the planet.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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