Adaxial cuticles of the O-ha-tsuki leaf of Ginkgo biloba. a: The adaxial thin cuticle of the lamina. Scale bar 100 μm. b: Outside of the adaxial cuticle of the lamina with one costal area and two intercostal areas. The pit in the centre of the picture might indicate a stoma (SEM). Scale bar 100 μm.