Fig. 4. One of four equally parsimonious neighbor-joining trees using the logdet distance option, for all Microcoleus vaginatus strains and outgroup taxa identified from Fig. 3 (Trichodesmium, Oscillatoria sancta). Bootstrap values exceeding 50% are shown above nodes to indicate support for the node. Strains are coded by desert as follows: ● = Great Basin Desert, ○ = Colorado Plateau, ▲ = Mojave Desert, □= Chihuahuan Desert.