Abstract
The chromosomes of liverworts are probably better known than those of any other group of comparable status in the plant kingdom. Data include observations on various categories of distinctive and specialized chromosomes, as well as chromosome numbers (Berrie, 1960). Several authors have attempted to discern evolutionary trends, usually in order to find support for one or another of the conflicting theories of phylogeny for the group. None of these interpretations is entirely satisfactory, and it is proposed to reexamine available data on chromosome number, heteropycnotic chromosomes, sex chromosomes, and nucleolar chromosomes in order to reach a more satisfactory assessment of evolutionary trends in the chromosome complements of liverworts. It will then be possible to consider the implications of the new interpretation as it affects general evolutionary problems.
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