No tinder fungus proper here in the Ozarks. I have charred shelf fungus which will take and hold a spark OK. As for unprepared materials around here, cattail fluff, thistle down, and similar stuff when in season. In the deeper woods you won't find it. I then scrape or shred cedar bark from down low on the trunk due to it being dry even in the rain usually. Grape vine, same o.
I don't do historical trekking anymore, but still hunt with a flintlock about half the time. The lock is a ready made flint and steel. I plug the touch hole and put some ffff powder in some shredded bark, stick it in the pan and snap the lock. Presto.