The blue-green algae are prokaryotic and unicelled to filamentous. They have the chief photosynthetic pigments as chlorophyll-a, β -carotene, myxoxanthin, lutein, C-phycocyanin, C-phycoerythrin and allophy cocyanin.
In green algae (Spirogyra)and bryophytes, the chief photosynthetic pigments are chlorophyll-a,b, carotene and xanthophyll.