摘要：Foliar fungi, especially endophytic fungi, constitute an important part of the microbiome of plants.Yet little is known about the composition of these communities.In this study, we isolated fungi from leaf tissues of the desert plant Welwitschia mirabilis to determine the culturable diversity of the foliar fungal community.The isolated fungal taxa, which grouped into 17 distinct lineages, were identified by sequencing elongation factor 1 alpha, beta-tubulin 1, beta-tubulin 2 and the internal transcribed spacer region.The culturable community was mainly composed of cosmopolitan fungal genera despite the unique taxonomic position of the plant and its geographic isolation.To test for endemism in two of the common fungal genera, Alternaria and Aureobasidium, we built haplotype networks using a global data set.Even this broad data set showed little evidence for specialisation within this unique host or its geographical location.The data suggest that the culturable members of communities of leaf-associated fungi in habitats with little plant coverage, such as the Namib Desert, are mainly established by long-distance aerially distributed fungal inocula and few of these taxa co-evolve with the host within the habitat.
