Good info and excellent photos! I learned something.
Will add that the inside of dead dry red cedar bark in the far west will scrape up into fine fibrous fuzz as well. I have a nephew who is excellent at primitive skills and he scrapes the cedar bark with the edge of a broken stone. The he uses that ball of fuzz to catch and ignite from the small hot "coal" produced by friction from a hand drill.
His demo to me was impressive, but done on a dry day in August. Our problem is to find dry cedar bark most of the rest of the year! But good info to know and worth checking just in case it is dry under a big deadfall, etc.
