Northwest Lichenologists


  • 14 Mar 2018 11:22 AM
    Message # 5978773

    Hi all,

    I need a little help with this lichen on moss over basalt. The spores are 33.2-38.4 X 10.2-12.8 microns. They fit Rinodina roscida in color and size. All spot tests are negative. The apothecia however are mostly convex with a few plane. The margin is also black rather than concolourous with the thallus. Since this comes from Northeastern California, just a few miles from Oregon, it would be a large distribution extension for R. roscida.

    Any ideas on this? Photos in the gallery labeled 3/12/18.


    Last modified: 14 Mar 2018 11:27 AM | Steve Sheehy
  • 16 Mar 2018 8:11 AM
    Reply # 5982220 on 5978773

    I don’t have the identification books in front of me, but the images look so much like our Buellia.

  • 16 Mar 2018 9:28 AM
    Reply # 5982330 on 5978773

    Hi Rebecca,

    Buellia was my first thought also but the spore size and negative spot tests don't match anything I can find. I am using Bruce's new books also.

  • 17 Mar 2018 9:28 AM
    Reply # 5983887 on 5978773

    Although Rinodina and Buellia spores look similar, this is lecideine, so it is a Buellia. It looks in the photo like maybe it is 3-septate? It sort of looks like Tetramelas terricolous but the spores on that are a bit smaller and it is on detritus or soil.

    Guess I can't help much more.

  • 17 Mar 2018 10:38 AM
    Reply # 5983996 on 5978773

    Hi Daph,

    That is the exact species I thought too. Besides the spore size, the spot tests are all negative also.

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