Fig. 7.2-13. Transverse section of cosmos (Cosmos) stem. These vessel elements are interconnected by circular bordered pits, visible here in transverse section. Compare this view to the large circular bordered pits in pine (Fig. 7.2-11) or to the scalariform pits of grape (Fig. 7.2-12a). We can tell that these must be circular bordered pits because they do not extend all the way across the contact face: the arrows indicate the individual pit chambers, and between each arrow are the borders of the pits.