(i) Red algae appear red due to the presence of r-phycoerythrin pigment. These are called marine mosses.
(ii) Red algae that form coral reefs are called coralline algae. They excrete calcium carbonate to form coral reefs.
(iii) Red algae increase the body’s immune system by producing white blood cells.
(iv) Nori in Japan, Jim in Korea and Laver in UK are made from Porphyra algae.
(v) They are a large group of marine algae with over 7000 species.
Some red algae- Corallina elongata, Bangia fuscopurpurea, Stylonema alsidii, Polysiphonia lanosa etc.