Symptomatic trees reveal a new pathogenic lineage in and two new species.

The diversity of fusaria in symptomatic trees in Greece, Italy and Spain was evaluated using morphological and molecular multi-locus analyses based on fragments of the calmodulin (), intergenic spacer region of the rDNA (IGS), internal transcribed spacer region of the rDNA (ITS), large subunit of the rDNA (LSU), RNA polymerase largest subunit (), RNA polymerase second largest subunit (), translation elongation factor 1-alpha () and beta-tubulin () genes. A total of 11 species (six spp., and five spp.) were isolated from dry root rot, crown, trunk or twig canker or twig dieback of citrus trees. The most commonly isolated species were , and . Three new species are described, i.e., and belonging to the newly described species complex; and belonging to the species complex. Results of pathogenicity tests showed this new complex to include prominent canker causing agents affecting several spp. In addition, two new species are described in , named and , the latter species being clearly differentiated from most members of this genus by producing large, up to nine-septate sporodochial conidia.