This is a rare rust of wide distribution. In Europe it occurs exclusively on Meum athamanticum which is not rare. Its morphology is unmistakable.
Provisional assessment: DD.
relatively wide spread in Europe and USA.
There appear to be two sub populations: a North American one on various Apiaceae, and a European one, predominantly on Meum.
There are few records and no recent specimens in the herbaria K, E, B, S and BPI.
Population Trend: Decreasing
Parasitic on Apiaceae generally in North America, mainly on Meum athamanticum in Europe. The host plants are not uncommon.
the threats to this species are unknown, and research into dispersal and survival strategies will need to be carried out.
Wilson M & Henderson DM. (1966). British Rust Fungi. University Press, Cambridge.
Helfer S. (1993). Rust fungi - A conservationist’s dilemma. In: Pegler DN, Boddy L, Ing B & Kirk PM. Fungi of Europe: Investigation, Recording and Conservation. 287-294. Royal Botanic Gardens, Kew.
Evans, S., Henrici, A., & Ing, B. (2006). The Red Data List of Threatened British Fungi. BMS [WWW document] URL http://www.britmycolsoc.org.uk/index.php/download_file/view/528/ [accessed 4 March 2015].
Farr, D.F., & Rossman, A.Y. Fungal Databases, Systematic Mycology and Microbiology Laboratory, ARS, USDA. Retrieved March 6, 2015, from http://nt.ars-grin.gov/fungaldatabases/