How do I add stippling to a map?

Is there a way to add stippling or hash marks to areas on a
geographical map? I have a mask of zeros and ones and I'd like the
areas where mask = 1 to be stippled. I'm using basemap to create the
global map.



Ivan Lima
Woods Hole Oceanographic Institution, MC&G MS #25
360 Woods Hole Road, Woods Hole, MA 02543-1543 USA