UK Fungi

Rhytisma ulmi?

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  • October 2, 2015 at 7:24 pm #29813
    JennyS

      I saw black spots similar to Rhytisma acerinum on an Elm leaf in Dorset yesterday – but Rhytisma ulmi isn’t shown on any NBN maps….?

      wz Rhytisma ulmi 151001 142 Ulmus.jpg

      [attachment=0]wz Rhytisma ulmi 151001 142 Ulmus.jpg[/attachment]

      October 2, 2015 at 10:00 pm #36603
      Chris Yeates

        Hi Jenny

        the similarity is superficial; you will see from Index Fungorum that “Rhytisma ulmi” has been used by three different authors – Fries first and then by two others (these latter two being invalid, as – nomenclaturally at least – they are illegitimate synonyms). What Fries and the others intended is uncertain so they’re effectively useless names.

        What you have there, I am almost certain, is the anamorphic stage of Platychora ulmi or, as I see it is currently named, Dothidella ulmi http://www.speciesfungorum.org/Names/SynSpecies.asp?RecordID=438295” class=”bbcode_url”>http://www.speciesfungorum.org/Names/SynSpecies.asp?RecordID=438295. Didymellaceae in the Pleosporales, so actually a long way from the Rhytismatales . . .

        See: http://www.nifg.org.uk/species/photos/photo128.htm” class=”bbcode_url”>http://www.nifg.org.uk/species/photos/photo128.htm (middle left thumbnail)

        best wishes

        Chris

        October 2, 2015 at 10:16 pm #36604
        JennyS

          Many thanks for the correction and identification Chris – I just grabbed a couple of photographs while searching for leaf miners but didn’t collect a leaf for closer examination

          October 4, 2015 at 9:29 am #36605
          poschiavanus

            Hi Jenny,

            Chris wrote a really informative piece of this a few years ago on WAB: IIRC in response to a query of mine very similar in tenor to yours. One of the biggest losses are many of these in-depth answers from Chris.

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