Description: Thallus white to creamy; Rimose, areolate, or not discernible. Apothecia black to greenish-brown, <1.1 mm.
Distribution: Washington; Colorado;
Substrate: On calcareous or acidic rock, bark of deciduous trees.
Description: Thallus variable, whitish; Apothecia black to brownish-black with well-developed margins.
Distribution: Washington; Uncommon in North America.
Substrate: On weathered calcareous or metalliferous rock.