@ARTICLE{TreeBASE2Ref18964, author = {Amir Sultan and Peter Johnston and Duckchul Park and Alastair Robertson}, title = {Two new pathogenic ascomycetes in Guignardia and Rosenscheldiella on New Zealand?s pygmy mistletoes (Korthalsella: Viscaceae)}, year = {2010}, keywords = {}, doi = {}, url = {http://}, pmid = {}, journal = {Studies in Mycology}, volume = {}, number = {}, pages = {}, abstract = {Two new pathogens, Guignardia korthalsellae and Rosenscheldiella korthalsellae, are described from New Zealand?s pygmy mistletoes (Korthalsella, Viscaceae).. Both form ascomata on living phylloclades with minimal disruption of the phylloclade tissue. Fungal hyphae within the phylloclade are primarily intercellular. Guignardia korthalsellae disrupts a limited number of epidermal cells immediately around the erumpent ascoma, while the ascomata of Rosenscheldiella korthalsellae develop externally on small patches of stromatic tissue that form above stomatal cavities. Rosenscheldiella is applied in a purely morphological sense. LSU sequences show that R. korthalsellae, as well as another New Zealand species, Rosenscheldiella brachyglottidis, are members of the Mycosphaerellaceae sensu stricto. Genetically, Rosenscheldiella in the sense we are using it is polyphyletic, LSU and ITS sequences placing the two New Zealand species in different clades within the Mycosphaerellaceae. Rosenscheldiella is retained for these fungi until generic relationships within the family are resolved. Whether or not the type species of Rosenscheldiella, R. styracis, is also a member of the Mycosphaerellaceae is not known, but it has a similar morphology and relationship to its host as the two New Zealand species. } }

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