@ARTICLE{TreeBASE2Ref17764, author = {Susumu Takamatsu and Seiko Niinomi and M. G. C. d. ?lvarez and Roberto Eloy ?lvarez and Mar?a Havrylenko and Uwe Braun}, title = {Phylogenetic relationships and generic affinity of Uncinula forestalis inferred from nuclear rDNA sequences}, year = {2005}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {Mycological Research}, volume = {109}, number = {}, pages = {}, abstract = {Based on 5.8S, 18S and 28S rDNA sequences, the phylogenetic position of Uncinula forestalis within the Erysiphales has been inferred. Although the appendages of the ascomata are Uncinula-like, i.e., unbranched with curved-coiled apices, U. forestalis is situated at the very base of the large Erysiphales cluster, far away from the "Pseudoidium clade" (Erysiphe emend., incl. Microsphaera and Uncinula) and clearly separated from the recently introduced basal genus Parauncinula. Morphologically U. forestalis differs from the species of Erysiphe sect. Uncinula (Uncinula) in having terminal, fasciculate (as in Podosphaera tridactyla), septate ascoma appendages and an Euoidium-like anamorph (conidia catenate). In Parauncinula, the appendages are also terminal, but not fasciculate, the ascospores are curved and an anamorph is lacking. This species is a basal, tree-inhabiting powdery mildew with some additional ancestral characteristics, viz., Uncinula-like appendages and 6-8-spored asci. The new genus Caespitotheca with C. forestalis as type species is proposed. We then calculated timing of radiation of U. forestalis and P. septata using a molecular clock of the Erysiphales (6.5 ?~ 10-10 per site per year in domains D1 and D2 of the 28S rDNA) and 28S rDNA data set. The result suggested that the radiation of U. forestalis and P. septata from the other Erysiphales occurred between 90 and 80 million years ago. Therefore, the radiation of the ancestral two species may have occurred in late Cretaceous.} }

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