A new species of Phaeobotryon was collected from Acer negundo, Forsythia × intermedia and Ligustrum vulgare from European Russia. Morphological and phylogenetic analyses of combined ITS, β-tubulin and EF1-α sequence data revealed that these collections differ from all other species in the genus. Therefore it is introduced here as Phaeobotryon negundinis sp. nov. It is characterized by immersed-erumpent, uniloculate conidiomata, bearing brown, ovoid, aseptate conidia, with broadly rounded apices and truncate bases. Conidia form a single septum at germination. Phaeobotryon negundinis is morphologically similar to P. cupressi, but has smaller conidia. This is the first time a Phaeobotryon species is reported on Acer negundo, Ligustrum vulgare and Forsythia × intermedia.
In this study, we revise the family Amplistromataceae (Amplistromatales) based on DNA sequence data derived from living cultures and morphological observation of type and additional specimens from herbaria worldwide. Combined analyses of ITS and LSU sequence data were used to reconstruct phylogenetic relationships of members for the family. We accept three genera; Acidothrix, Amplistroma and Wallrothiella in Amplistromataceae based on the morphology and phylogeny. Modern descriptions and illustrations are provided with notes and a key to the genera is provided.
A new record of Lopadostoma fagi is described in Italy from Fagus sylvatica based on morphological and molecular data. It has effused-pulvinate stromata immersed in the host tissue, with a narrow, black, carbonized encasement. The ectostromatic disc is visible as a clypeus and surrounded by the reddish brown bark surface. In the combined phylogenetic analysis of ITS, LSU andRPB2 sequence data, the strain derived from the specimen clustered with other L. fagi strains with high bootstrap support. A morphological description with detailed photographs for L. fagi is provided in this study.
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