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Bacidia arceutina?

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  • November 26, 2025 at 10:02 pm #33113
    SylviaD
    Participant

      Hi,

      I found this lichen on an Elder twig and it keyed out to Bacidia arceutina, but I just wanted to check I haven’t gone wrong somewhere. All tests negative – K-, C-, Pd-, UV-

      The apothecia only had yellow/brown pigments in the epithecium and hypothecium, which faded to just yellow in K (photos below). There were no purple or green pigments.

      The spores were in the range 35-55X1.2-2.5 um and were 3 to 7 septate.

      The hymenium was I+ blue.

      Thanks,

      Sylvia

      November 28, 2025 at 2:58 pm #46751
      Neil Sanderson
      Senior Moderator

        Sylvia

        Looks good, a nice species, widespread but never frequent

        Neil

        December 1, 2025 at 8:42 am #46752
        SylviaD
        Participant

          Thanks Neil,

          I also have a couple of samples from a while ago, when I was just starting microscopy that I put aside as mysteries, that I now think are this lichen. Nice to be able to solve those mysteries as well.

          Thanks,

          Sylvia

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