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Ustilago species causing leaf-stripe smut revisited.

IMA Fungus 2018 June
Leaf-stripe smuts on grasses are a highly polyphyletic group within Ustilaginomycotina , occurring in three genera, Tilletia , Urocystis , and Ustilago . Currently more than 12 Ustilago species inciting stripe smuts are recognised. The majority belong to the Ustilago striiformis -complex, with about 30 different taxa described from 165 different plant species. This study aims to assess whether host distinct-lineages can be observed amongst the Ustilago leaf-stripe smuts using nine different loci on a representative set. Phylogenetic reconstructions supported the monophyly of the Ustilago striiformis -complex that causes leaf-stripe and the polyphyly of other leaf-stripe smuts within Ustilago . Furthermore, smut specimens from the same host genus generally clustered together in well-supported clades that often had available species names for these lineages. In addition to already-named lineages, three new lineages were observed, and described as new species on the basis of host specificity and molecular differences: namely Ustilago jagei sp. nov. on Agrostis stolonifera , U. kummeri sp. nov. on Bromus inermis , and U. neocopinata sp. nov. on Dactylis glomerata.

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