Fucus belongs to class-Phaeophyceae, in which reserve food is found in form of laminarin, mannitol and oil.
Chara belongs to class-Chlorophyceae, in which reserve food is found in form of starch and oil.
Porphyra and Gracillaria belong to class-Rhodophyceae, in which reserve food is found in form of floridean starch and Galactan- $\mathrm{SO}_4$ polymers.