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Molecular phylogenetic analyses of ITS-LSU rDNA sequence data demonstrate that Melanconis species occurring on Juglandaceae are phylogenetically distinct from Melanconis s.str., and therefore the new genus Juglanconis is described. Morphologically, the genus Juglanconis differs from Melanconis by light to dark brown conidia with irregular verrucae on the inner surface of the conidial wall, while in Melanconis s.str. they are smooth. Juglanconis forms a separate clade not affiliated with a described family of Diaporthales , and the family Juglanconidaceae is introduced to accommodate it. Data of macro- and microscopic morphology and phylogenetic multilocus analyses of partial nuSSU-ITS-LSU rDNA, cal , his , ms204 , rpb1 , rpb2 , tef1 and tub2 sequences revealed four distinct species of Juglanconis . Comparison of the markers revealed that tef1 introns are the best performing markers for species delimitation, followed by cal , ms204 and tub2 . The ITS, which is the primary barcoding locus for fungi, is amongst the poorest performing markers analysed, due to the comparatively low number of informative characters. Melanconium juglandinum (= Melanconis carthusiana ), M. oblongum (= Melanconis juglandis ) and M. pterocaryae are formally combined into Juglanconis , and J. appendiculata is described as a new species. Melanconium juglandinum and Melanconis carthusiana are neotypified and M. oblongum and Diaporthe juglandis are lectotypified. A short description and illustrations of the holotype of Melanconium ershadii from Pterocarya fraxinifolia are given, but based on morphology it is not considered to belong to Juglanconis . A key to all treated species of Juglanconis is provided.

Juglanconis gen. nov. on Juglandaceae, and the new family Juglanconidaceae (Diaporthales)