green sulphur bacteria
green sulphur bacteriaa group of photosynthetic BACTERIA, capable of carrying out ANOXYGENIC PHOTOSYNTHESIS. They are often found in deep sediments in lakes and ponds, and they use compounds such as hydrogen sulphide as electron donors (instead of water used in OXYGENIC PHOTOSYNTHESIS), producing sulphur rather than oxygen.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005