Five new species of Hymenoscyphus (Helotiaceae, Ascomycota) with notes on the phylogeny of the genus

摘要

Five new species of Hymenoscyphus-H. aurantiacus, H. macrodiscus, H. qinghaiensis, H. tetrasporus, and H. yui-are recognized by morphological characters and DNA sequence data. Detailed descriptions, illustrations, and discussions concerning morphologically similar and phylogenetically closely related species are provided for each species. The phylogeny of 39 Hymenoscyphus species was explored based on the individual internal transcribed spacer of nrDNA, D1/D2 domain of 28S nrDNA, and partial beta-tubulin gene sequences, as well as the combined dataset. The sampled species clustered as a highly supported group in the phylogenetic trees with six main clades formed. Correlations between the morphological and phylogenetic features are discussed.