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Asexuality across the kingdom Fungi and the taxonomic challenges of species delineation.
P. W. CROUS (1), J. Z. Groenewald (1). (1) CBS Fungal Biodiversity Centre, Utrecht, Netherlands

Recent changes to the International Code of Nomenclature for algae, fungi and plants have significant implications for practical plant pathology. Other than the abolishment of Latin and the implementation of name registration, asexual genera will be integrated with sexual genera of fungi, and a single name will be used to communicate about species. By employing DNA-based techniques, genera and species can be linked in the absence of all stages of their life cycle. To complicate matters, however, many genera are either poly- or paraphyletic, and many pathogens are in fact species complexes. Even though it is clear that the phenotype conveys limited information about true genealogical relationships, close to 80 % of all novelties described per year still lack DNA sequence data, which represents one of the biggest challenges facing our community. Although the internal transcribed spacer region has been selected as the universal fungal barcode, it only successfully identifies 73% of the taxa screened across kingdom Fungi to species level, suggesting that secondary barcodes will be needed to provide accurate identifications. This is especially true for species in many important plant pathogenic fungal genera such as <i>Botryosphaeria</i>, <i>Calonectria</i>, <i>Cercospora</i>, <i>Colletotrichum</i>, <i>Ilyonectria</i>, <i>Mycosphaerella</i>, <i>Phoma</i> and <i>Pseudocercospora</i>. Based on these findings, it is clear that even though many diseases are associated with species complexes, some of these species are in fact also complex in that they have a complicated ecology and life cycle.<p><p>Keywords:

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