Someone here has a 1 lb bag of Gawith Best Brown that would be perfect for smoking in this pipe.
Not true. It takes both heat and pressure (autoclave) to kill mold spores. But this is mold growing on dense, intact wood. I'm betting that it can be permanently removed by cleaning it well, then not letting it stay damp in a dark place.It doesn't take a lot of heat to kill mold, like 140f for 20 minutes or so.