The rhodophyceae is called red algae, as it imparts often a red colour to the thallus.
There are about 400 genera and 4000 species of red algae. These algae contain pigments like phycoerythrin, phycocyanin, chlorophyll a and d, beta carotene etc. They are predominantly marine, though fresh water types are also available.
Example of Red algae (Rhodophyceae)1. Bangiales
Examples: Bangia, Porphyra
2.Nemalionales
Examples: Lemanea, Thorea, Chaetangium, Neccaria
3.Gelidiales
Examples: Gelidium
4. Cryptonemiales
Examples: Gloeopeltis, Aedos, Ethelia, Corallina
5.Gigantiales
Examples: Platoma, Hypnea, Gracilaria, Rhabdonia
6. Rhodymeniales
Examples: Champia, Rhodymenia
7.Ceramiales
Examples: Ceramium, Sarcomenia, Chondria, Amansia