Identificaciones de jameschurchill

on a phaeophyscia i think, probably one of the good ones but i'll see if I can figure that one out.
edit: it was not on a phaeophyscia, just pyxine.

Known location

Thallus underside black. On a slowly rotting yellow birch snag

Several thalli on the trunks of two adjacent red maples.

Atop large erratics in the lake

walking a trail I’ve walked a hundred times — on a large white ash - thallus very dried out — on peeling bark

1 thallus on Sugar maple