Hypogymnia beringiana (Krog) McCune 2008
A tundra species of the Bering Straits region, with erect and rather like a Dactylina, but whitish gray with conspicuous black mottling. Erect, dactylina-like black-mottled lobes with isotomic dichotomous branching, sparsely perforate, lobe cavity with white or dark ceilings and dark floors, on tundra sod or rocks.
Thallus suberect and imbricate to erect, to 5 cm tall; texture cartilaginous; branching isotomic dichotomous to irregular, with subcontiguous or separate lobes, adventitious budding rare; upper surface pale greenish gray with sparse to dense black mottling, in exposed microsites becoming dark brown or dark gray near the lobe tips, smooth, epruinose; lower surface black, rugose, sparsely perforate; lobe profile even to ± nodulose; lobe width 0.8–3.0 mm; lobe width/height ratio 1-3:1; lobe tips and axils sparsely perforate, medulla hollow, ceiling of cavity white to dark brown, floor of cavity dark; soredia, isidia, and lobules absent. Apothecia unknown.