One of the sea fuci, forming a commercial article from the Malay Isles to China, where it is made into a strong cement. The best is the Gracilaria spinosa. Agal-agal derives its name from Tanjong Agal on the north coast of Borneo; where it was originally collected. It is now found in great abundance throughout the Polynesian Islands, Mauritius, &c. It is soluble, and forms a clear jelly used by consumptive patients. It fetches a high price in China. It is supposed that the sea-swallow derives his materials for the edible bird's nests at Borneo from this fucus.