Mannitol is reserve food in
Rhodophyceae
Chlorophyceae
Phaeophyceae
Xanthophyceae
C.
Phaeophyceae
Class Phaeophyceae includes brown algae Brown algae are marine plants. Chief pigments found in the members of this class are chlorophyll a and c -carotene, violaxanthin, fucoxanthin, lutein, diatoxanthin. Reserve food is laminarin, mannitol and oils.