Puccinia poarum
Puccinia poarum | |
---|---|
Scientific classification | |
Kingdom: | Fungi |
Division: | Basidiomycota |
Class: | Urediniomycetes |
Order: | Uredinales |
Family: | Pucciniastraceae |
Genus: | Puccinia |
Species: | P. poarum |
Binomial name | |
Puccinia poarum E. Nielsen, 1877 | |
Synonyms | |
Puccinia conspicua Mains 1933 |
Puccinia poarum,, the coltsfoot rust gall[1] or meadow grass rust, is a plant pathogen. This fungal parasite forms a bright yellow gall, 1–2 cm across, on the underside of leaves of the coltsfoot (Tussilago farfara)[2] and infects, but does not gall grasses of the Poaceae family.[3]
Characteristics
This yellow gall consists of relatively large and circular raised yellow or orange-red spots on the underside of the leaf,[4][5] often with a purple margin[2] and sometimes a central hole. The cup structures on the lower surface are relatively few in number (20-30).[1] The upper surface of the leaf shows a yellow ring and no swelling. The rust has distinctive reproductive structures (aecia and spermogonia), present.[4] The rust is necrophytic, a term applied to a parasitic organism that obtains its nutrients from the dead cells and tissues of its host organism.
Identification
Coleosporium tussilaginis is a rust fungus with which P. poarum is sometimes confused. C. tussilaginis usually appears somewhat later in the season and tends, not being a gall, to be spread all over the leaf rather than forming the discrete circular clusters typical of P. poarum; it is also less obvious on the upper leaf surface[6] and lacks the purple margin[2] with the central hole characteristic of the gall.
P. poarum is found on at least seventy plant hosts.[7]
Distribution
In the United Kingdom it is locally common[4] and widely distributed.[8] Northern hemisphere to South America.[9]
See also
References
- Notes
- 1 2 Puccinia poarum. Accessed : 2010-08-17
- 1 2 3 Stubbs, Page 70
- ↑ Bioimages. Accessed : 2010-08-17 Archived 2010-03-08 at the Wayback Machine.
- 1 2 3 Redfern, Page 260
- ↑ Hancy, Page 106
- ↑ Wild About Britain. Accessed : 2010-08-17.
- ↑ Fungal database : Accessed 2010-08-17 Archived 2007-01-30 at the Wayback Machine.
- ↑ NBN Database. Accessed : 2010-08-17
- ↑ Fungal Database. Accessed : 2010-08-17
- Sources
- Hancy, Rex (2000) The Study of Palnt Galls. The Norfolk and Norwich Naturalists' Society.
- Redfern, Margaret & Shirley, Peter (2002). British Plant Galls. Identification of galls on plants & fungi. AIDGAP. Shrewsbury : Field Studies Council. ISBN 1-85153-214-5.
- Stubbs, F. B. Edit. (1986) Provisional Keys to British Plant Galls. Pub. Brit Plant Gall Soc. ISBN 0-9511582-0-1
External links
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