Chloroflexus (clore-owe-lfex-us), this pair of matched micrographs shows bacteria, (mostly Synechococcus and Chloroflexus) from a mat sample. The phase contrast shot to the left shows the bacteria, the image to the right shows autofluorescence. The Chloroflexus cells do not exhibit autofluorescence. Phase contrast and fluorescence. Material provided by Mike Ferris from Mushroom Spring, a thermal site in Yellowstone National Park, photographs by Mike Ferris and David Patterson.