Is this a Lichen or other Saprophyte?

I found this little bit of bark, probably from a Chestnut Oak, on my deck yesterday. Color is blue-green. Anybody have more info?

Check out usnea strigosa, https://lichenportal.org/cnalh/taxa/index.php?taxon=54697&clid=1201 it looks very much like it (a little old and worn though?) and if it is you have an excellent medicinal lichen.

The core will be stretchy on fresh usnea and branched along its length.

Here is a link to my post about it here at permies https://permies.com/t/130945/mushrooms-mosses-lichens-ID-hikes#1037669

Here is another link https://www.inaturalist.org/taxa/121176-Usnea-strigosa

I wonder if you can see more on the branches in the tree?

Your link to usnea strigosa photos is much appreciated!

A lot of my middle-aged oaks have that blue-green sheen, so I suspect there's a massive amount in these woods.