Carrigeen, Carrageen n. (Also written carragheen, carageen) A small, purplish, branching, cartilaginous seaweed (Chondrus crispus), which, when bleached, is the Irish moss of commerce.
... We have as yet in this country no substitute for animal gelatine. I have experimented with carrageen or Irish moss and the Sea-moss Farine preparation, and find them unsatisfactory. It is impossible to make a clear jelly with them, and by soaking in water to destroy the sea flavor, the solidifying property is lost. In England they have a vegetable gelatine (Agar Agar) ... — The Golden Age Cook Book • Henrietta Latham Dwight
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