Posting some photos of presumed Fuscopannaria from Fidalgo Island, WA, on serpentinite, open forest, near salt water, about 40m elevation. Thallus margins pruinosity distinctly blueish. Spores average 12x7µm, most with large oil drop.
Feeling a bit out on a limb in thinking Fuscopannaria praetermissa group, and further out wondering about F. thiersii, of which Jørgensen (2000 Survey of the Lichen Family Pannariaceae on the American Continent, North of Mexico. The Bryologist 103, 4 pp. 670-704) mentions “may be a specialist of heavy-metal and/or ultrabasic rocks”. Not sure how to interpret McCune and Geiser 2009 regarding F. aurita - “ear-shaped frosted lobules differ from the ascending knobs sometimes found in F. praetermissa and F. thiersii” but thinking mine is more knobby. Not many photos available to compare.