Growing on the outer surface of the bark of Acer, Fagus, etc.
Growing out of fissures of the bark and wood of Hickory, Acer, etc.
The occasional forms in 'er' and 'il' will have similar power (acer, basil).
It is the dwarf maple (Acer glabrum) of the Northwest coast.
If you have been careful in your search you will finally stop at Acer saccharum.
A single genus, acer, ...