Heliocephala variabilis and Pseudopenidiella vietnamensis: Two New Hyphomycetous Species in the Microthyriaceae (Dothideomycetes) from Vietnam

摘要

In a survey of microfungi from plant debris collected in Vietnam, two new hyphomycetous species were found, which belong to the genera and and the family ( , ). Maximum Likelihood and Bayesian Inference sequence analyses of the internal transcribed spacers (ITS) and large subunit (LSU) of the ribosomal DNA barcodes allowed assessing the phylogenetic relationships of the new species with other species of the respective genera. sp. nov. was closely related to , , and , from which it was morphologically distinguished by its smaller conidiophores and non-rostrate conidia of up to four septa on the natural substratum. sp. nov. was related to and and differed from the former principally by its lack of microcondiophores and from by having larger macroconidiophores and smooth conidia. Key morphological features to distinguish the accepted species in and are also provided. In addition, was excluded from the genus on the basis of its morphological features.