Distribution: West of Cascades crest in Washington; northern British Columbia to northern California; Minnesota, Wisconsin, Michigan, Maine to Georgia; Quebec, Ontario.
Habitat: Damp forest.
Substrate: On bark of deciduous trees.
Conservation Status: Not of concern
Thallus greenish-grey, lobes 1-2 mm wide, puffed, with obvious perforations, lower surface black and without rhizines.