Thallus ± closely attached, irregularly spreading, 1-3(-5) cm diam., often scattered and fragmentary, corticolous. Lobes subdichotomously to irregularly branched, 1 mm wide, plane to concave, upper surface pale yellow-green, smooth, shining, often faintly pale yellow-maculate. Perforations rounded, sparse, to 0.5 mm diam. Soralia numerous, laminal, often arising from the edge of perforations, becoming ± elevated, flange-like and then eventually helmet-shaped and vesicular. Lower surface black or brownish-black, naked, smooth, slightly shining, brownish at apices, eperforate. Apothecia unknown. Chemistry: Usnic and lecanoric acids. Cortex K+ yellow; medulla K-, C+ rose-red, KC+ red, Pd-.