[1] It was unambiguously identified in Acaryochloris marina in the 1990s.

[2] It is present in cyanobacteria which use energy captured from sunlight for photosynthesis.

[3] Chl d absorbs far-red light, at 710 nm wavelength, just outside the optical range.

[4] An organism that contains Chl d is adapted to an environment such as moderately deep water, where it can use far red light for photosynthesis,[5] although there is not a lot of visible light.

[6] Chl d is produced from chlorophyllide d by chlorophyll synthase.