Trametes conchifer

This is a key to gilled mushrooms, that is, mushrooms having a definite cap with a fertile surface consisting of gills. The fruiting body usually also has a stem, although that may be lateral or absent (usually, then, the mushroom is growing from wood). You can use this key to identify mushrooms that you find.

Fertile surface usually a layer of vertical tubes, of which the mouths are visible as pores on the underside of the cap or shelf.
Fruiting bodies usually tougher or harder than the "normal" gilled mushrooms, being leathery, corky, or woody. But they can be quite tender while actively growing
Once grown, they do not decay easily, remaining on the substrate for months or years
They often grow on wood, although a few are terrestrial (even those are usually growing on buried wood)
Fruiting body is usually a flat shelf, or hoof-shaped, protruding directly from the substrate, although sometimes it may have a short stalk.
Some forms never grow away from the substrate at all, so that all that is visible of the fruiting body are the pores.
Sometimes the pores are so minute that the fertile surface seems solid, until you look closely

Growing on wood

Not fitting the other choices, not stipitate
In making choices below based on texture and size, place the emphasis on texture: if left alone, some of the smaller ones can eventually get quite big; and even the huge ones have to start out small at first

Individual caps small (max. 2-3" across)
Soft or tough, but not hard when fresh, although they may become hard when they dry out
All thin-fleshed fruiting bodies go here, especially if compound or imbricate

Fruiting in dense clusters of thin-fleshed shelving fruiting bodies

Cap surface usually furry
Cap either thin, tough and zonate; or whitish, thick and corky
Trimitic hyphae, yet fruiting body not hard
Spores inamyloid, cylindrical

Non-duplex Trametes     Section Entire fruiting body white to cream, including flesh; corky Individual caps up to 14" wide, but more often 6-8"; up to 1" thick

Links from Look-alikes Discomycetes     Class Flesh thin and brittle, breaking when bent, like old rubber or plastic. There are never any fibers in it. Fruiting body composed of a single circular sheet of tissue, though that sheet may be curved up at the edges like a cup, or stood on end

Trametes conchifer     (Schweinitz: Fries) Pilát