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Opegrapha niveoatra conidia?

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  • July 3, 2024 at 6:43 pm #32840
    peterbisset
    Participant

      An ‘Opegrapha’ on yew bark looked like O. vulgata and the 6-8 septate ascospores fitted this taxon. However, the conidia look distinctive, short and curved 5-6 x 1-1.5 mu. Are these the ‘ short and curved’ conidia of O. niveoatra (x1000)

      20240703190923946.jpg

      [attachment=0]20240703190923946.jpg[/attachment]

      July 3, 2024 at 6:51 pm #46107
      aspeca
      Participant

        Thanks, Peter. They look very much like it. My own micropgraphs of O. niveoatra conidia, for comparison:

        Opegrapha niveoatra 20230408A-12 Bungay.jpg

        [attachment=1]Opegrapha niveoatra 20230408A-12 Bungay.jpg[/attachment]

        Opegrapha niveoatra 20230408A-13 Bungay.jpg

        [attachment=0]Opegrapha niveoatra 20230408A-13 Bungay.jpg[/attachment]

        July 3, 2024 at 7:15 pm #46108
        chriscant
        Participant

          Yes, they match Opegrapha niveoatra conidia from our trip to Loo Gill Cumbria. And also found on Harris a couple of months back, which might be new for Outer Hebrides VC110. In both the conidia were around: 5.6×1.6μm and curved.

          July 4, 2024 at 5:18 pm #46109
          peterbisset
          Participant

            Thanks for the confirmation, we could do with a conidia showcase.

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