As you can see Christina and I have a difference of opinion. With Stereum hirsutum at its prime, I'd expect to see underlying shades of orange/brown, with a white hairy overlay. Sure, with age the hairiness can erode colours become murkier. My impression is that these photos include specimens still at or close to their prime (but I could be wrong) and so, given the duller colours, incline to Xylobolus illudens. That species has shifted to and from Stereum over the years and it might be back in favour as a Stereum, which I'll need to check. Our healthy difference of opinion shows again how useful a view of (or a comment about) the colour of the underside would be.
and This is an example where a view (or a comment about) the underside would settle things
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