algae is usually green in color
cyanobacteria is blue_green_algae. gulfweed is brown_algae. rockweed is brown_algae. yellow_green_algae is algae. green_algae is marine_organism. sea_lettuce is green_algae. green_algae is alga. green_algae is algae. brown_algae is algae. yellow_green_algae is alga.