Red algae :
1. Unicellular and microscopic. Only a few are filamentous and heterotrichous.
2. Phycoerythrin, phycocyanin and phycobilins pigments are present.
3. Reserve food material is Floridean starch.
4. Chlorophyll 'a' present.
5. e.g., Gelidium,Polysiphonia.
Brown algae :
1.Filamentous and heterotrichous.
2.Fucoxanthin pigments is present.
3.Reserve food material is Laminarian starch.
4.Chlorophyll 'a' and 'c' present.
5.e.g., Laminaria, Fucus and Sargassum.