The genus Melanconis (Melanconidaceae, Diaporthales) in the strict sense is here re-evaluated regarding phylogenetic structure, taxonomy, distribution and ecology. Using a matrix of sequences from ITS, LSU, ms204, rpb2, tef1 and tub2, eight species are recognised and their phylogenetic positions are determined. Based on phylogenetic, morphological and geographical differentiation, Melanconis marginalis is subdivided into four subspecies. Melanconis italica is reduced to a subspecies of Melanconis marginalis. The two species Melanconis larissae from Betula sp. and M. pacifica from Alnus rubra are described as new. Melanconis alni and M. stilbostoma are lectotypified and M. alni, M. marginalis and M. stilbostoma are epitypified. All GenBank sequences deposited as Melanconis alni are shown to actually represent M. marginalis and those as M. marginalis belong to the newly described M. pacifica. Currently, Alnus and Betula are the sole host genera of Melanconis. All species and subspecies are (re-)described and illustrated. In addition, the neotypification of Melanconium pterocaryae is here validated.

中文翻译：

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Melanconis（Diaporthales）属。

严格意义上的Melanconis属（Melanconidaceae，Diaporthales）在这里重新评估了系统发育结构，分类学，分布和生态学。使用来自ITS，LSU，ms204，rpb2，tef1和tub2的序列矩阵，可以识别八个物种并确定其系统发生位置。根据系统发育，形态和地理差异，将Melanconis marginalis细分为四个亚种。意大利黑变种减少到边缘黑变种。Betula sp。的两个Melanconis larissae。和来自Alnus rubra的M.pacifica被描述为新的。Melanconis alni和M. stilbostoma被电化，M。alni，M。marginalis和M. stilbostoma被表型。已显示所有沉积为Melanconis alni的GenBank序列实际上代表边缘分枝杆菌和那些代表边缘分枝杆菌。边缘属于新描述的太平洋支原体。目前，Alnus和Betula是Melanconis的唯一寄主属。（重新）描述和说明了所有物种和亚种。另外，在这里验证了翼龙黑色素的新型化。