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.

Thanks,

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