When beachgoers say there's a brown blob of seaweed floating in the ocean, they really mean it. The brown seaweed is called sargassum, a type of macroalgae that floats in large masses, according to an article on the Ocean Conservancy website. In the water, sargassum is considered harmless to people. On land, #sargassum begins to rot and produces smelly hydrogen sulfide and ammonia, which can irritate eyes, ears and noses. People with asthma or other breathing illnesses may have trouble breathing if they inhale too much of it. 🔗 palmbeachpost.com or link in bio to learn more 📸 Greg Lovett, pbpost; gettyimages #floridabeaches #beaches #lakeworthbeach #seaweed