Abstract
A cladistic analysis of the order Marchantiales based on morphological characters (43 characters) did not agree with the classification in current use. Molecular sequences of nuclear-encoded 26S rRNA genes of seven species of the order and two out-groups (1254–1299 bp) were analysed to solve this contradiction. Results between morphologial and sequence data are conflicting. The combination of the two data sets shows that a weighting of the morphological data corresponding to equal contributions of the two sets resolves contradiction. We demonstrate that the structure of two data sets can be compatible even if the resultant trees are incongruent. Addition of a few compatible data (for instance, via character weighting) can result in congruent trees. The taxonomic incongruence we observed could illustrate a case of too limited molecular sampling.
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