Stereum fasciatum is a basidiomycete crust fungus, which means it does not have the traditional mushroom gills nor stem, but rather grows flat or with shelf-like protrusions on wood.

[1][2] Stereum fasciatum grows in a fan-like shape with a broad base, and an upper surface that is covered in tufts of upright hairs.

The distinguishing features of Stereum fasciatum is the combination of the non-yellowing undersurface, broad base attachment, and the upright hairs.

[1] Stereum subtomentosum is a similar species, also having upright hairs and a broader attachment, but it stains yellow, which S. fasciatum does not.

[1][3] Stereum lobatum is another yellowing species, but it also usually has a narrower attachment to the substrate and felted hairs instead of upright (use a hand lens).