Gelidium Because of its shape like antlers, it got its name. Antlers are one kind of marine red algae, which grow on rocks at low tide and are mainly distributed in Bohai Sea and Yellow Sea in China. Gelidium is rich in nutrients, which will be helpful to human health if eaten regularly. Gelidium is transparent, like jelly, crisp and tender in taste, and it is also an important raw material for extracting agar.