The following types of Chl a are known:
Chl a 660, Chl a 670, Chi a 680, Chl a 685, Chl a 690 and Chl a 700-720. The short wavelength forms of Chi a are mainly present in photosystem II, while the long wavelength forms are mainly present in photosystem I.
Chi b is present in all green algae and higher plants. Most of the Chl b is present in PSII. There are two forms of Chl b, Chl b 640 and Chl b 650.
Chl c. Brown algae contain a compound called Chl c which is related to chlorophyll. Chi d has been reported in the red algae.
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