Cover illustration: The cover photograph gives an equatorial overview of four immature pollen grains of Marcgravia purpurea at the tetrad stage. Diversity of phylogenetic characters within the family such as shape, sexine ornamentation patterns and ultrastructure of the pollen wall helps to understand intergeneric relationships. It also indicates a poor correlation between pollen features and the high variety of pollinators. See Lens et al. (pp. 1047–1060).
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