Collection location: Southeast Portland, Multnomah Co., Oregon, USA [Click for map]
On dead fallen twig of Quercus palustra. The most interesting thing about this lichen is the least visible. On the underside near the twig attrachment, the back is like shiny black lacquer. Not what I would have expected at all.
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Looks like there might be two things growing intermingled here. One sure looks “inflated” — the one that will have the black lacquered underside — this is a Hypogymnia, but I dare not even guess which of half a dozen species it is that are all common in your area.