Collection location: Russian Gulch State Park, Mendocino Co., California, USA [Click for map]
On exposed weathered fence post.
THALLUS: very thin and stretched, olive to black, matte, wrinkly, no isidia at all, naked below
APO: abundant, minute (0.2-0.5 mm), not pruinose, black to reddish
Need to look at spores to be sure of ID.
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