This looks more like Auricularia than Exidia.
Exidia recisa, now known as Exidia crenata, tend to have a flattered edge with sharp ridges either side. There can also have concave depressions separated by ridges that can dry out and darken. Auricularia has a smoother edge. See some pictures here: https://wpamushroomclub.org/product/auricularia-auricula/
Note that there is one image of Exidia crenata in that set, it is correctly labelled as Exidia. I will update the web site soon.
This video gives a nice comparison of the two species: https://www.youtube.com/watch?v=CJPowNSEHTQ
I 100% change my mind, after looking again, particularly at the larger one at upper right! I see the “chipped” surface, like worked flint. My apologies!
Worked flint, I like that description!
Everyone seems to know what that means, seems to be a good way to describe it!
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