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Contents: Preface. 1. Introduction. 2. Palaeozoic pteridospermales. 3. Glossopteridaceae and Mesozoic pteridospermales. 4. Bennettiales (Cycadeoideales). 5. Pentpxylales. 6. Cycadales. 7. Cordaitales. 8. Coniferales. 9. Taxales. 10. Ginkgoales. 11. Gnetales. 12. General conclusions. Bibliography. Index.