The type specimen The species epithet honors Stanton Cook, professor emeritus of ecology, evolution, and geography at the University of Oregon.

The upper surface of the thallus is shiny to matt, starting blue-grey when young and transitioning to yellowish brown-gray to brownish gray with age.

The lower surface of the thallus is gray and densely covered with white to tan tomentum of even length, except for a small bare zone near the margins.

The disc is reddish-brown and flat to slightly concave, with the apothecial margin thalline and 0.1 mm wide, the same color as with the thallus and becoming covered with isidia.

Its habitat is commonly associated with areas around riparian corridors or bodies of water, such as lakes, and can be found on the bark of hardwood trees like Fraxinus latifolia and Populus trichocarpa, as well as shrubs like Alnus and Salix.