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Journal of Palaeosciences
The origin and evolution of different exine layers of palynofossils is analysed in the light of accumulating ultrastructural data. Semi-diagramatic illustrations based on the published TEM results of various exine types representing a cross section of extinct and extant plant groups are given for easy reference and comprehension. Some of the important palynological questions and issues discussed in the present work are imprecise use to describe the infra-tectum of pollen, of the flexible termdoi:10.54991/jop.1989.1647 fatcat:s5nwojf27vgznc2xjyztspn6gm