Thought this was a rust but under scope it is weird

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adampembs
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Thought this was a rust but under scope it is weird

Post by adampembs » Mon Sep 21, 2015 3:50 pm

I'm afraid I don't know the plant
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Adam Pollard
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Simon Horsnall
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Re: Thought this was a rust but under scope it is weird

Post by Simon Horsnall » Mon Sep 21, 2015 5:12 pm

I think my mycological knowledge (lack of) has already been demonstrated but if I could make a suggestion based on what I think your plant might be. I think it is one of the Curcurbits and so does Pseudoperonospora cubensis (Berkeley and Curtis) Rostovstev fit?

Of course if my plant ID is wrong then...

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Lancashire Lad
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Re: Thought this was a rust but under scope it is weird

Post by Lancashire Lad » Mon Sep 21, 2015 6:09 pm

Hi all,

Adam, I think those leaves have the general look of Butterbur - Petasitis hybridus.

If they are, your rust should be Coleosporium tussilaginis - of which there's a great deal about at the moment on the leaves of Coltsfoot (Tussilago farfara).

I would have thought that if you'd scraped some of the orange sori content onto a slide, you should have got plenty of spores. The stuff in your micro-shots looks more like oil drops. :?

Regards,
Mike.
Common sense is not so common.

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Chris Yeates
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Re: Thought this was a rust but under scope it is weird

Post by Chris Yeates » Mon Sep 21, 2015 6:11 pm

Hi
this is the uredinial stage of Coleosporium tussilaginis on butterbur Petasites hybridus. Unusually, this rust occurs on a wide range of plant genera (including several different families); it is particularly common on this plant and on coltsfoot often colouring almost the whole of the undersides of leaves.
Perhaps the fungus is not yet mature; those orange globules are certainly not spores - perhaps aggregations of oily pigment?
cheers
Chris
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Re: Thought this was a rust but under scope it is weird

Post by adampembs » Mon Sep 21, 2015 6:32 pm

Thanks all. :)
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