@ARTICLE{TreeBASE2Ref17750, author = {Susumu Takamatsu and Uwe Braun and Saranya Limkaisang and Sawwanee Kom-un and Yukio Sato and James H. Cunnington}, title = {Phylogeny and taxonomy of the oak powdery mildew Erysiphe alphitoides sensu lato}, year = {2007}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {Mycological Research}, volume = {111}, number = {}, pages = {}, abstract = {Phylogenetic analyses of Erysiphe alphitoides sensu lato using sequences of the rDNA ITS region and the D1/D2 domains of the 28S rDNA revealed a complex consisting of several genetically and morphologically distinguished taxa, including the already described Erysiphe alphitoides sensu stricto and E. hypophylla. The ascomata (chasmothecia) of E. hypophylla are morphologically very similar to those of E. alphitoides, but the two species are easily distinguishable by their symptoms as well as the shape and size of the conidia. The fungus on Quercus phillyraeoides, distributed in warmer regions in southern Japan, is genetically clearly separated from E. alphitoides sensu stricto, and morphologically characterized by having chasmothecia with appendages consistently shorter than the chasmothecial diameter. This fungus, named Erysiphe quercicola in this paper, is also able to infect some other oak species, and it is genetically identical with anamorphs on some tropical trees of other plant. Collections of E. alphitoides sensu lato on Quercus acutissima and Q. variabilis, both belonging to Quercus sect. Cerris, are genetically distinct from E. alphitoides sensu stricto, E. hypophylla and E. quercicola. They form two genetically and morphologically differentiated groups. The hypophyllous taxon on Q. acutissima and Q. variabilis, named Erysiphe hypogena in this paper, is characterized by forming distinctive persistent hypophyllous mycelial patches, causing necrotic discolorations of the host tissue. The epiphyllous taxon on these hosts, for which the name E. epigena is proposed, differs in having epiphyllous mycelium, no leaf discolorations, and smaller chasmothecia with fewer appendages.} }

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