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Evolution of the placenta in liverworts
The placenta is a specialized region at the interface between the sporophyte and parental gametophyte in embryophytes. Stemming from a comparative analysis of placental structure in putatively basal liverwort taxa, the work by Carafa et al. (pp. 299-307) recognizes a plesiomorphic (primitive) type of placenta in the liverwort lineage and discusses possible inter-relationships of the different types of placenta present in major bryophyte groups.
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