habit smooth bark ornamental witch-hazel in Seattle, with Arthonia radiata https://northwest-lichenologists.wildapricot.org/page-1816539/200774897#photo
section H2O perithecium diameter ≈ 300µm https://northwest-lichenologists.wildapricot.org/page-1816539/200774894#photo
spores H2O average 21.5x8µm;
KOH average 20x8µm; dimensions may be distorted but seems like more detail visible vs. H2O - perispore? https://northwest-lichenologists.wildapricot.org/page-1816539/200774890#photo
Trentepohlia - photobiont? https://northwest-lichenologists.wildapricot.org/page-1816539/200774887#photo
perithecium section H2O polarized highlights erumpent characteristic https://northwest-lichenologists.wildapricot.org/page-1816539/200774884#photo
Looks reasonable to me. A. plumbaria and cinereopruinosa are very similar. Your spore sizes would argue for the latter, but I associate it mainly with Fraxinus. Not sure about the lichenization -- often hard to tell the local community from the symbionts.
Thanks Bruce. When moving focus up and down the pseudoparaphyses seemed anastomosing branched to me, which seemed inconsistent with A. plumbaria. Somewhat visible here -
https://northwest-lichenologists.wildapricot.org/page-1816539/200908986#photo (H2O)
https://northwest-lichenologists.wildapricot.org/page-1816539/200908983#photo (KOH)
Realize I would need to see the Trentepohlia closely associated with hyphae to infer lichenization.
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