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Microfungus on Chamerion? (Rosebay Willowherb)

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  • June 20, 2015 at 9:49 pm #29477
    adampembs
    Keymaster

      Assumed it to be a rust on what i think is Chamerion, but doesn’t look like photos of Pucciniastrum epilobii, what can it be please?

      June 20, 2015 at 11:00 pm #34995
      Lancashire Lad
      Keymaster

        Hi Adam,

        I don’t think this can be Chamerion angustifolium, as the leaves on that plant grow singly, in a spiral whorled manner around the stem.

        Your plant looks to have opposite pairs of leaves.

        It doesn’t look particularly hairy, but I think with the paired leaves and side shoots, it is showing the general growth manner of Epilobium hirsutum. But I would have liked to see a close up of both sides of a complete mature leaf, to get a better idea.

        If it’s not E.hirsutum – then I’m stumped.

        Regards,

        Mike.

        June 20, 2015 at 11:10 pm #34996
        JennyS

          Looks good for Epilobium hirsutum (Great Willowherb)

          June 20, 2015 at 11:18 pm #34997
          adampembs
          Keymaster

            Great, thanks. Then it looks a good match for Puccinia epilobii (looking at the photo on Chris’ Yorkshire Rusts pdf.)

            June 21, 2015 at 8:15 am #34998
            adampembs
            Keymaster

              Rethinking, as these spores are uredospores, right? So P.epibolii has no uredosori stage, so this must be P.pulverulenta.

              June 21, 2015 at 11:38 pm #34999
              Chris Yeates

                adampembs wrote:

                Rethinking, as these spores are uredospores, right? So P. epibolii has no uredosori stage, so this must be P. pulverulenta.


                Exactly!

                this is how a site like this should work – help from Mike and Jenny and a logical approach from Adam; in my experience in contrast to P. pulverulenta, P. epilobii is rather rare and usually on Epilobium palustre or E. obscurum not E. hirsutum. Infected plants are distinctly etiolated and stunted – see top left image here – having checked later I think the host was Epilobium palustre:

                Puccinia epilobi.jpg

                [attachment=0]Puccinia epilobi.jpg[/attachment]
                cheers

                Chris

                June 21, 2015 at 11:56 pm #35000
                adampembs
                Keymaster

                  Thanks for confirmation, Chris. The single record in Pembs, 1987, was yours! P.epilobii is not recorded here.

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