Ian Morgan sent me a picture of a rust on Greater Burnet (
Sanguisorba officinalis), determined by Nigel Stringer as the localised
Xenodochus carbonarius at Ynys Tawela near Brynamman.
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Xenodochus carbonarius |
Yesterday I noticed another very conspicuous rust growing on Burnet-rose (
Rosa pimpinellifolia) at Whiteford, which turned out to be the rather long-winded
Phragmidium rosae-pimpinellifoliae. I also noted another on Eyebright (
Euphrasia tetraquetra) that I was unable to identify.
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Phragmidium rosae-pimpinellifoliae |
Rusts are pathogen
ic fungi that affect a wide range of plant species and once you start looking it is surprising how many infected species you can find. Many are gall-forming and disperse by producing yellow, orange or brown telia that liberate aerial basidiospores, thereby spreading the infection to new host plants.
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