| evidence for high degrees of specialisation, evolutionary diversity, and morphological distinctiveness in the genus bremia. | bremia lactucae is one of the most important pathogens in lettuce production. recent molecular studies revealed considerable genetic variation in this species complex. however, only few accessions from the same host have been examined for most species and no study investigating the morphological distinctiveness of phylogenetic lineages of bremia has so far been reported. thus it is believed that morphological species delimitation in bremia is not feasible. in the present study, multiple accessio ... | 2010 | 21315308 |