@ARTICLE{TreeBASE2Ref19043, author = {Monique Louise Sakalidis and Giles E. St. J. Hardy and Treena I Burgess}, title = {Use of the Genealogical Sorting Index (GSI) to delineate species boundaries in the Neofusicoccum ribis-parvum species complex}, year = {2010}, keywords = {}, doi = {}, url = {http://}, pmid = {}, journal = {Molecular Phylogenetics and Evolution}, volume = {}, number = {}, pages = {}, abstract = {Neofusicoccum is a recently described genus of common endophytes and pathogens of woody hosts, previously placed in the genera Botryosphaeria. Many morphological characteristics routinely used to describe species overlap in Neofusicoccum, and prior to the use of molecular phylogenetics, isolates from different hosts and locations were often misidentified. Two cryptic species N. ribis and N. parvum were initially described from different continents and recently another four species within this complex were described using fixed nucleotide polymorphisms for differentiation. During a survey of eucalypt cankers in eastern Australia, a collection of morphologically similar Neofusioccum isolates were obtained. This collection was analysed within the framework of the morphological, ecological and phylogenetic species recognition concepts. Morphological data based on spore measurements, together with pathogenicity trials were considered alongside molecular analysis, which included multiple gene phylogenies constructed from four nuclear gene regions. We also used the Genealogical Sorting Index statistic to provide evidence for the status of terminal taxa in the phylogenetic analysis. Isolates examined, exhibited overlapping morphological and culture characteristics, similar pathogenicity to excised stems and shared hosts within the same locations. Phylogenetic analysis separated isolates into 8 clades corresponding to six described species: N. ribis, N. parvum, N. kwambonambiense, N. cordaticola, N. umdonicola, N. batangarum, and two new clades. GSI support indicated combined phylogenetic data was monophyletic for all clades and all p-values were significant allowing us to reject the null hypothesis that all groups were from a single mixed group. Consequently the description of Neofusicoccum occulatum is presented.} }

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