title: Erysiphe abbreviata on cherry bark oak--morphology, phylogeny and taxonomy.
abstract: Powdery mildew on cherry bark oak (Quercus falcate var. pagodifolia) collected in Tennessee, USA, was determined to be Erysiphe abbreviata, a species confined to North America. The diagnostically important anamorph of this species is described for the first time. Sequence analyses of the rDNA ITS region and D1/D2 domains of the 28S rDNA were used to obtain phylogenetic data for and taxonomic conclusions about this species. The structure of the anamorph (Oidium subgen. Pseudoidium) and the molecular data support the placement of this species in Erysiphe emend. (including Microsphaera) as a species separate from the Eurasian Erysiphe alphitoides.
authors.affiliation: Institute of Biology, Geobotany and Botanical Garden, Herbarium, Martin Luther University, Neuwerk 21, D-06099 Halle, Germany.
authors.forename: Uwe
authors.initials: U
authors.lastname: Braun
authors.forename: Ainong
authors.initials: A
authors.lastname: Shi
authors.forename: Margaret
authors.initials: M
authors.lastname: Mmbaga
authors.forename: Susumu
authors.initials: S
authors.lastname: Takamatsu
authors.forename: Rangsi
authors.initials: R
authors.lastname: Divarangkoon
authors.forename: Pengyin
authors.initials: P
authors.lastname: Chen
mesh_terms: D001203:Ascomycota / Q000145:classification / Q000235:genetics / Q000302:isolation & purification* / Q000648:ultrastructure; D001483:Base Sequence; D004271:DNA, Fungal / Q000737:chemistry / Q000235:genetics; D021903:DNA, Ribosomal Spacer / Q000737:chemistry / Q000235:genetics; D008969:Molecular Sequence Data; D010802:Phylogeny; D010935:Plant Diseases / Q000382:microbiology*; D016133:Polymerase Chain Reaction; D029963:Quercus; D012339:RNA, Ribosomal, 28S / Q000737:chemistry / Q000235:genetics; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA
chemical_list: D004271:DNA, Fungal; D021903:DNA, Ribosomal Spacer; D012339:RNA, Ribosomal, 28S