Hymenoscyphus pseudoalbidus, the correct name for Lambertella albida reported from Japan
Recent molecular analyses separate Hymenoscyphus pseudoalbidus (causal agent of ash dieback in Europe) from the morphologically scarcely distinguishable H. albidus. Hymenoscyphus albidus was reported (as "Lambertella albida") on petioles of Fraxinus mandshurica
in Japan. Phylogenetic analysis in the present study shows Japanese "L. albida" to be conspecific with H. pseudoalbidus but with a higher genetic variability compared to European isolates. The presence of croziers at the ascus base was found to be a clear distinguishing character
of H. pseudoalbidus. Our phylogenetic analysis of the combined ITS and LSU-D1/D2 dataset supports Hymenoscyphus as more appropriate than Lambertella for H. pseudoalbidus. As the Hymenoscyphus clade includes members with two major characters (presence of substratal
stroma and brown ascospores) currently used to circumscribe Lambertella, the generic delimitation of Lambertella requires redefinition.
Keywords: CHALARA FRAXINEA; HELOTIACEAE; RUTSTROEMIACEAE
Document Type: Research Article
Publication date: 04 March 2013
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