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Cuticular studies of Ginkgoites Seward from the Lower Cretaceous of Patagonia. The anatomy and ultrastructure of the leaf cuticles of Ginkgoites ticoensis Archang. and G. skottsbergii Lund. is studied. Both taxa were collected in Santa Cruz province, G. ticoensis from the Anfiteatro de Tico Formation (Aptian) and G. skottsbergii from the Kachaike Formation (Albian). The cuticular studies were made by means of electronic microscopy (SEM, TEM). These observations showed that G. ticoensis has hypostomatic leaves, papillae on both cuticles, and monocyclic stomata with 5-7 papillate subsidiary cells; while G. skottsbergii presents amphistomatic leaves, and monocyclic to dicyclic stomata with 6-8 subsidiary cells partially papillate. At the ultrastructural level the cuticular membrane has three layers, which are clearly distinct in both species. Comparisons with the leaf cuticle of other ginkgoalean taxa are also made.