Thallus crustose, thin, effuse, granular, powdery or continuous, ± coriaceous, matt or shining, whitish or pale glaucous grey to olivaceous, sometimes white-arachnoid towards margins, spreading in irregular patches or ± orbicular, corticolous. Photobiont green, . Apothecia immersed to sessile, ± urceolate, rounded to irregular, lecanorine, disc concave to plane, pale yellowish-brown to red-brown or blackened, with or without a whitish pruina, margins entire, or split and fractured and somewhat gyalectiform, with or without farinose soredia. Hymenium 130-200(-250) µm tall, colourless. Epithecium granular, brown-black. Paraphyses slender, septate, densely conglutinate, anastomosing, apices swollen, suffused yellowish-brown. Hypothecium colourless or straw-yellow to dark brown. Ascospores (1-)4-8 per ascus, fusiform, and slightly curved to oblong-ellipsoid, colourless, 3-13(-23)-septate, cells lenticular.