Purple and Green(Anoxygenic Photptrophic) Bacteria

(a)Phase contrast micrograph and (b)transmission electron micrograph of the greeen bacterial consortium chlorochromatium aggregatum.In(a)the nonphototrophic central oganismis much lighter in color than the pigmented phototrophicbacteria.Note the chlorosomes(arrows)in(b).The entire consortium is about 3*6um.