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The members of Rhodophyceae are commonly called as red algae, as the predominant pigment is the red pigment, r-phycoerythrin in their body. The members of Phaeocyceae are commonly termed brown algae, because of the pigment fucoxanthin, which provides them a distinct greenish-olive color.
The main points of difference between red algae and brown algae are
| Red algae | Brown algae |
| Red algae is grouped under the class Rhodophyceae | Class Phaeopyceae includes members of brown algae. |
| Major pigments include Chlorophyll a, d and phycoerythrin | Major pigments include chlorophyll a, c and fucoxanthin |
| They store food as Floridean starch | They store food as Mannitol and Laminarin |
| Cell wall of red algae is composed of cellulose, pectin and poly-sulphate esters. | Cell wall of brown algae is rich in cellulose and algin. |
| They lack flagella | Members of brown algae possess 2, unequal, lateral flagella |
| Example Polysiphonia, Gelidium, Gracilaria | Examples: Ectocarpus, Dictyota, Laminaria |
Final Answer
The major difference between red and brown algae is the predominance of red pigment r-phycoerythrin in red algae and fucoxanthin in brown algae. In red algae food gets stored as floridean starch while in brown algae stored food is Mannitol and Laminarin.
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