title: Baobabopsis, a new genus of graminicolous downy mildews from tropical Australia, with an updated key to the genera of downy mildews.
abstract: So far 19 genera of downy mildews have been described, of which seven are parasitic to grasses. Here, we introduce a new genus, Baobabopsis, to accommodate two distinctive downy mildews, B. donbarrettii sp. nov., collected on Perotis rara in northern Australia, and B. enneapogonis sp. nov., collected on Enneapogon spp. in western and central Australia. Baobabopsis donbarrettii produced both oospores and sporangiospores that are morphologically distinct from other downy mildews on grasses. Molecular phylogenetic analyses showed that the two species of Baobabopsis occupied an isolated position among the known genera of graminicolous downy mildews. The importance of the Poaceae for the evolution of downy mildews is highlighted by the observation that more than a third of the known genera of downy mildews occur on grasses, while more than 90 % of the known species of downy mildews infect eudicots.
authors.affiliation: Integrative Fungal Research (IPF), Georg-Voigt-Str. 14-16, D-60325 Frankfurt am Main, Germany;; Biodiversity and Climate Research Centre (BiK-F), Georg-Voigt-Str. 14-16, D-60325 Frankfurt am Main, Germany; Senckenberg Gesellschaft für Naturkunde, Senckenberganlage 25, D-60325 Frankfurt am Main, Germany; Goethe University, Faculty of Biosciences, Institute of Ecology, Evolution and Diversity, May-von-Laue-Str. 9, D-60483 Frankfurt am Main, Germany.
authors.forename: Marco
authors.initials: M
authors.lastname: Thines
authors.affiliation: Integrative Fungal Research (IPF), Georg-Voigt-Str. 14-16, D-60325 Frankfurt am Main, Germany;; Biodiversity and Climate Research Centre (BiK-F), Georg-Voigt-Str. 14-16, D-60325 Frankfurt am Main, Germany.
authors.forename: Sabine
authors.initials: S
authors.lastname: Telle
authors.affiliation: Integrative Fungal Research (IPF), Georg-Voigt-Str. 14-16, D-60325 Frankfurt am Main, Germany;; Biodiversity and Climate Research Centre (BiK-F), Georg-Voigt-Str. 14-16, D-60325 Frankfurt am Main, Germany; Senckenberg Gesellschaft für Naturkunde, Senckenberganlage 25, D-60325 Frankfurt am Main, Germany.
authors.forename: Young-Joon
authors.initials: YJ
authors.lastname: Choi
authors.affiliation: Plant Pathology Herbarium, Department of Agriculture and Fisheries, Ecosciences Precinct, GPO Box 267, Brisbane, Qld 4001, Australia.
authors.forename: Yu Pei
authors.initials: YP
authors.lastname: Tan
authors.affiliation: Plant Pathology Herbarium, Department of Agriculture and Fisheries, Ecosciences Precinct, GPO Box 267, Brisbane, Qld 4001, Australia.
authors.forename: Roger G
authors.initials: RG
authors.lastname: Shivas
keywords: Peronosporaceae; Poaceae; cox2; genus key; nrLSU; phylogeny