Collection location: Southeast Portland, Multnomah Co., Oregon, USA [Click for map]
Photo represents pale grayish-white to off-white crustose lichen barely covering bark surface, but extending into bark cracks as well. Photo is close-up of area approximately 1.3×1.3 inches.
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Your only chance with crusts like this is a photo with far better resolution (say, through a dissecting scope), but even then you will often need to see spores and microscopic apothecial characteristics to get anywhere. But there are a few crustose genera that are recognizable by sight (at least to an expert, not necessarily me!)… with a better photo.