Abstract

A new species of Keissleriella (Lentitheciaceae) is described from a dead stem of Dactylis sp. collected in Italy. The new taxon is supported by morphology and phylogenetic analysis of SSU, LSU and TEF1α sequence data. The combined analysis of gene data indicates that Keissleriella dactylidis sp. nov. forms a distinct clade within the genus Keissleriella. The species is characterized by immersed, erumpent, dark gray to black ascomata, with papilla containing brown periphyses, and cylindrical asci with hyaline, ellipsoid, 4–5-septate ascospores, with a thin mucilaginous sheath. A synopsis of the characteristics of Keissleriella dactylidis and other species is provided and the new species is justified and compared with similar taxa. This is the first report of a Keissleriella species from the grass Dactylis.

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