Algae also use chlorophyll, but various other pigments are present, such as phycocyanin, carotenes, and xanthophylls in green algae, phycoerythrin in red algae ( rhodophytes ) and fucoxanthin in brown algae and diatoms resulting in a wide variety of colors.
32.
Although classified as a red alga, " C . merolae " is blue-green : it makes little if any of the red pigment phycoerythrin, and hence only displays the second red-algal pigment, phycocyanin, and the green pigment chlorophyll.
