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| Only four species of Hypohelion (Rhytismataceae) have been reported worldwide. In the present study, two new species of Hypohelion, Hypohelion bifusiforme and Hypohelion ventricosum, are described on living twigs of Ericaceae from Southwest China. Bifusiform ascospores and intraepidermal ascoma development are two conspicuous characteristics of the two new species, by which they can be distinguished from other species of Hypohelion. By its apically strongly swollen paraphyses, H. ventricosum differs from H. bifusiforme. The phylogenetic position of the two species within Rhytismataceae was analyzed based on the combined sequences of LSU rDNA, ITS rDNA and mtSSU rDNA. Although the other species of Hypohelion and some species of other genera of Rhytismataceae formed a strongly supported evolutionary clade, a resolution on the genus level was not yet possible. |
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| Keywords:Ascomycota；Rhytismatales；taxonomy；phylogeny；multigene analyses |
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