*Chloroflexus* turns orange in the dark and green in the sunlight because of the different typed of photosynthesis it can perform. While it does not have flagella it can glide to be motile in its environment.

Green non-sulfur bacteria, *Chloroflexus*

Green non-sulfur bacteria use other compounds for oxidation such as hydrogen.

University of Wisconsin - Madison

Phototrophic purple and green bacteria can be classified into four main groups based on their ability to use sulfur compounds for oxidation: purple sulfur bacteria, purple non-sulfur bacteria, green sulfur bacteria, and green non-sulfur bacteria.

Classification of Purple and Green Bacteria

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Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

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This type of purple bacteria can oxidize hydrogen sulfide (H<sub>2</sub>S).

Purple Sulfur Bacteria *Chromatium*

This type of purple bacteria can use hydrogen for oxidation.

Purple non-sulfur bacteria 

Green sulfur bacteria use sulfide (S<sup>2-</sup>) for an oxidation reaction to make green bacteriochlorophyll.  

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