Phaeocalicium polyporaeum is a tiny mycoparasitic fungus, seen here on its most common host, Trichaptum cf biforme, although it has also been reported on Trametes versicolor.
Great, now I’m gonna be looking even more like a crazy person when walking in the woods, as I crawl around sticking my face up to every Turkey Tail (Trametes Versicolor) that I pass looking for these. Jk, thanks for sharing!
You'll have more luck checking Trichaptum - I've never found them on Trametes yet.
There's also a similar looking species, Gliocladium polyporicola, which grows on Stereum hirsutum, so may as well check all the small shelf fungi!