What is common amongst the members of Chlorophyceae, Rhodophyceae and Phaeophyceae?
The members of Chlorophyceae, Rhodophyceae and Phaeophyceae have the pigment chlorophyll a. Members of Phaeophyceae have two unequal lateral flagella. Members of Rhodophyceae have polysulphate esters in their cell wall and floridean starch as reserve food material.