Abstract
Intra- and intergeneric distances derived from maximum-likelihood phylogenetic trees inferred from 254 nuclear ITS rDNA sequences were examined for seven families of euascomycetes, representing five classes. The intra- and intergeneric distances were well separated in most cases, but the distances varied between families. The analysis of the distance distributions provides a powerful tool for identifying certain taxa with highly deviating distances and thus cases of excessive lumping or splitting. Some cases of lumping and splitting found in different families are briefly discussed. The results of the analysis show that the generic concepts differ between the families. The consequences for nomenclature are discussed and a method abandoning binomial nomenclature while keeping the style of species names is recommended to ensure nomenclatural stability.
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