Page 1 of 1

Blisters/pustules on Hawkweed

Posted: Mon Jul 17, 2017 7:42 am
by alindsay
Well, I think it's the leaf of a Hawkweed, but definitely an Asteraceae, so could it be Albugo tragopogonis?

I would be grateful for an opinion.

Thanks in advance.

Re: Blisters/pustules on Hawkweed

Posted: Wed Jul 19, 2017 3:03 pm
by Chris Yeates
Hello Alison
One has to be careful that an invertebrate gall is not responsible in these cases. However, given the irregular sizes and shapes and the fact that I think I can see white spores and burst pustules I'm pretty certain this is indeed Pustula tragopogonis. See ... 22&f=false for explanation of new name. This species has also been called Pustula obtusata as on a Wikipedia page, but that name appears to be illegitimate following nomenclatural rules see: ... dID=561187


Re: Blisters/pustules on Hawkweed

Posted: Thu Jul 20, 2017 4:13 pm
by alindsay
Thanks Chris

I had ruled out insect activity, finding no larvae when opening the pustules and having studied the descriptions of likely galls in Redfern & Shirley's reference book.

Very useful & interesting information on the rust. I will go with Pustula tragopogonis.

Thanks again.

Regards Alison