The number of known chlorophyll structures have shown increments through the years: up until 1960 only three structures had been described, 20 up until 1970, and more than 100 up until 1980. Higher plants, ferns, mosses, green algae, and the prokaryotic organism prochloron present only two chlorophylls (“a”and “b”), and the rest of them have been found in other groups such as algae and bacteria