I came across this interesting video and the narrator is quite a character (and sounds like a pro). Its worth watching.

The 10 Best Natural Tinders You Can Find In a Forest, and How to Use Them

One of my all time favorites is not on his list - Utah juniper. Eucalyptus bark is pretty good as well.

It all depends on your local forest.

Good list. My personal favourite is birch bark. It's like magic! Add a little pine pitch and/or fatwood, maybe a cattail or jute twine for a little extra "poof" and you're off to the races if you've done good fire prep before you light it. .... Of course, if you don't understand the basic principles of making a fire, you're pooched no matter what you use.

Yes, Birch Bark is my Favorite, but the types of Tinder's available are very Forest, Elevation, and Location specific

... and different burning qualities. Coal fungus and tinder fungus (and chaga) are slower burning tinders that will smolder for long periods and are great for storing heat for later ignition of other tinders and fuel (hence they are transportable). Whereas, the fluffy cotton from a cattail, hair from your head and magnesium shavings for example are "flash" tinders and they need a secondary tinder to catch and sustain the ignition of your fuel bundle because they just burn too fast.

The biggest thing people need to take away is that not only is natural tinder a great material but it often needs to be processed and broken down into smaller fibres as the person in the video aptly showed. Fabricating birds nests/bundles and gathering all the fuel before igniting is necessary otherwise you are left with a very short term fire.

Note: I've never used thistle or fireweed before - I shall have to give them a try.