Because of the numerous cryptic species in the C. fimbriata complex and the history of human-mediated movement of host-specialized strains around the world (Baker et al., 2003), it is difficult to know which of the reports of C. fimbriata in specific countries are of native populations of C. fimbriata or of exotic populations. For some cases where there is clear evidence that the pathogen was introduced, such as on the ornamental cultivars of Syngonium (Walker et al., 1988), it appears that the fungus has been restricted to cultivated plants in nurseries or greenhouses. Otherwise, the introduced strains are considered to be invasive populations.