Gaultheria bracteata pollen (from Luteyn & Cotton 11307).  Left: pollen tetrad in polar view;  center: equatorial view (bar for both left and center photos = 10 µm);  right: close-up of mesocolpial region (bar = 1 µm).  Redrawn from Flora Neotropica Monographs 66: 392, fig. 6J-L.  1995.