Must beg to differ, ever so slightly. I'm very familiar with two natural tinders that need not be dry - in the conventional sense. Bark of the white birch (may apply to other birches, I just have no experience) and fat pine ("lightern"). I've used both after days of rain (and it was still raining). In the case of the birch I can remember one time in Ontario after 14 straight days of rain (summer 1970), took some bark, shook it off, shredded with knife, struck sparks and had fire. Fed with lots of birch bark and twigs - um good! Fat pine is naturally "waterproof" too. When you can find it, I think it's best. I totally agree with you - when you're in the woods and see good tinder - grab it. I always carry a ZipLoc just for that.