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Abstract
Allozyme variation was examined at 33 enzyme loci for 96 populations from throughout the geographical range ofConocephalum conicum (L.)Dum. (Marchantiales, Hepaticae). Variation was partitioned into five discrete groups, suggesting that this morphologically defined species is genetically heterogeneous. The degree of differentiation among these groups, as measured by genetic distance, is as large as is commonly reported between different vascular plant species, and much larger than that between conspecific populations. In Europe, two of these genetically distinct groups (S and L) occur sympatrically, but apparently do not interbreed. Geographical ranges of the other three groups (A, C, and J) are probably allopatric with the exception that the range of S, the most genetically divergent group, overlaps with group A in N. America. It is suggested that these five natural assemblages constitute different sibling species.
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Department of Genetics, A. Mickiewicz University, Dabrowskiego St. 165, 60-594, Poznan, Poland
Ireneusz J. Odrzykoski & Jerzy Szweykowski
- Ireneusz J. Odrzykoski
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- Jerzy Szweykowski
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Odrzykoski, I.J., Szweykowski, J. Genetic differentiation without concordant morphological divergence in the thallose liverwortConocephalum conicum.Pl Syst Evol178, 135–152 (1991). https://doi.org/10.1007/BF00937961
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