E-Flora BC: Electronic Atlas of the Flora of British Columbia

Species description:
Thallus small to medium but not minute; lobes averaging to more than 1.5 mm wide, always dorsiventral; isidia present or absent, distinctly wrinkled upper surface AND
Lobe margins naked; isidia, if present, naked AND
Lobes broad or, if elongate, then never both erect and terminating in distinctly swollen tips; lobe tips averaging to less than 0.2 mm thick when moist, seldom strongly wrinkled when dry; habitat and distribution various AND
Lower surface densely white-woolly throughout (except often naked along lobe margins) AND
Upper surface smooth or rarely in part bearing few scattered wrinkles; isidia not at all dimpled at tips; distribution various AND
Upper surface olive brownish to blackish, naked; mature isidia usually (but not always) remaining globose