Rust on Southern Marsh Orchid

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  • June 10, 2015 at 5:32 pm #29459
    Gracie

      Looking for rusts can be very addictive on an old photo I saw what looked like rust, so had a good look today and found this growing on a Southern Marsh Orchid. As usual please let me know if I am wrong.

      Rust fungus Puccinia sessilis (1) (541x640).jpg

      [attachment=0]Rust fungus Puccinia sessilis (1) (541×640).jpg[/attachment]

      June 10, 2015 at 5:57 pm #34949
      Lancashire Lad
      Moderator

        Great photo Joan. ;)

        On Dactylorhiza praetermissa – Southern Marsh Orchid, the only rust that produces cluster-cups such as in your photo is Puccinia sessilis.

        The cluster-cups are the aecidial stage, (stage I), of the rust.

        There is another rust: – Melampsora epitea var.epitea, which attacks Southern Marsh Orchid, and at first glance might look similar.

        But its stage I aecidia are “caeomoid” which means that they have no well defined shape.

        So you can be confident that Puccinia sessilis is what you’ve got.

        (The same rust attacks Ramsons too: – http://www.fungi.org.uk/viewtopic.php?f=9&t=9#p58).

        Regards,

        Mike.

        June 10, 2015 at 6:14 pm #34950
        Gracie

          Thanks Mike that is what I had named it and I had seen the same thing in a photo as you said so wasn’t 100 % sure they are fascinating aren’t they I keep looking at all sorts of marks now on anything. Joan

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