FIGURE 3. Marskea cuspidata leaf structure. A, E, F in Discovery of isolated leaves of Marskea (Taxaceae) in the Middle Jurassic sediments of Irkutsk Basin (East Siberia, Russia)

FIGURE 3. Marskea cuspidata leaf structure. A, E, F. Cells of the stomatal bands. Flat papillae on periclinal walls are shown by arrows. A. Specimen no. 19-11/8-3. E. External view on SEM, specimen no. 19-11/7 holotype. F. Specimen no. 19-11/7 holotype. B. Lower surface of the epidermis, external view on SEM, specimen no. 19-11/7 holotype. C. Cells of the marginal non-stomatal zone (left) and the stomatal band (right), internal view on SEM, specimen no. 19-11/9-1. D. Cells of the marginal non-stomatal zone, external view on SEM, specimen no. 19-11/7 holotype. G, J, M. Stomatal complexes with proximal papillae. G. Specimen no. 19-11/7 holotype. J. External view on SEM, specimen no. 19-11/7 holotype. M. Specimen no. 19-11/8. H, I, K. Stomatal complexes with cuticular ring around stomatal pit. H. Specimen no. 19-11/8. I. Specimen no. 19-11/6. K. External view on SEM, specimen no. 19-11/7 holotype. L. Adjacent stomatal complexes, specimen no. 19-11/6. N, O. Stomatal complexes, internal view on SEM, specimen no. 19-11/7 holotype.