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Thallus: Foliose, consisting of flat branches which are
tightly attached to the bark and which may grow so closely side by side
that they seem to form a continuous sheet; the branches 0. 5-4.0 mm (.02-.
15 in) wide. Upper surface of branches smooth, dull, pale ashen gray
to pale tannish gray when dry; similarly colored when wet. Lower
surface light colored, gray to buff, with blackish rhizines. Margin lacking
hairs.
Apothecia: (Figs. A & B) Common, 1-3 mm (.04-.12 in) wide, black or very dark brown with a whitish thalline margin. Soredia: Lacking. Isidia: Lacking. Comments: This species is distinguished from other gray, foliose species by its abundant apothecia. |