Purple and green(Anoxygenic Photptrophic)Bacteria Membrane systems of phototrophic bacteria as revealed by the electron mi croscope. (a) Purple phototrophic bacterium, Ectothi orhodospira nobilis, showing the photosynthetic membranes in flat sheets (l amell ae).(b) Chromaatiun sp., strain D, another purple phototrophic bacterium, showing the membranes as indivi dual vesicles. (c) Green phototrophic bacterium. Pelodictyon sp, showing location of chlorosomes. (d) Heliobacterium chl orun, showing the lack of internal photosynthetic membranes.Purple and Green(Anoxygenic Photptrophic) Bacteria