Plate 3. Fig. 3. Outer Cell layers of A. bravoanus showing thickened hypodermal walls (H. Hernández et al. 1977). Fig. 4. Seed of A. (subg. Ariocarpus) scaphirostris (Anderson 1695). Fig. 5. Testa of A. scaphirostris (Anderson 1695). Fig. 6. Seed of A. fissuratus var. fissuratus (Anderson 1062). Fig. 7. Testa of A. fissuratus  var. fissuratus (Anderson 1062). Fig. 8. Seed of A. bravoanus (H. Hernández et al. 1977). Fig. 9. Testa of A. bravoanus (H. Hernández et al. 1977). Fig. 10. Papillae on tubercle of A. bravoanus (H. Hernández et al. 1977). Bar = 100/1000 microns as indicated. ( SEM micrographs by E.F. Anderson)