Hypogymnia apinnata

Hypogymnia apinnata, the beaded tube lichen, is a corticolous (bark-dwelling) foliose lichen in the family Parmeliaceae. It is found along the Pacific coast of North America from Alaska to the northwestern United States, and also occurs inland in parts of the Pacific Northwest. A separate population is also known from the Canadian Arctic. The lichen forms pale grey, hollow lobes (strap-like sections of the thallus) that are often somewhat swollen and typically lack the small edge projections found in closely related species. It grows mainly on conifer trees in coastal and inland forests, and is most common in cool, humid climates at low to moderate elevations. Brown fruiting bodies are frequently produced, but the species does not form soredia (powdery propagules) typical of many similar lichens....read more on Wikipedia.