Excellent reminder, Eastree! Welcome to the forum!
Thank you, bacpacjac!
So I did a bit more reading on the subject, and found a few more suggestions.
Samhain: Is there a ready source of Spanish moss you might be able to take a little? I know it's protected in some areas, but if you only snag a handful, you may be able to cram a bit in your pocket and it's not enough to adversely affect its local growth.
Also, cedar bark is very fibrous and easily shredded. When I was a kid, I played with some bark from one of my grandfather's trees. Given time, you can get it almost fluffy.
Either way, the general advice seems to be that not many things, as they occur in nature, will take a spark, and even fewer will respond like a fluffy cotton ball and flare up so easily. But some people out there have made some suggestions:
Distress the tinder into fibers (or finer fibers). Rubbing dry grasses in your hands is one method; shaving bark with a knife is another.
Also, some suggest stacking tinder in the nest (and some even suggest using a nest if one is available!), so it's a pocket progressing from the lightest and airiest possible fluff to catch the spark to progressively thicker materials which will ignite and continue burning.