Gram-Negative Oxygenic Photosynthetic Bacteria

**Definition:** Widely distributed unicellular or multicellular bacteria. The CYANOBACTERIA use chlorophyll a and phycobilins for oxygenic photosynthesis while genera in the Prochlorales use both chlorophyll a and b but not phycobilins.

**Tree numbers:** - B03.440.475

**Synonyms:** - Gram Negative Oxygenic Photosynthetic Bacteria