Plant Parasites of Europe

leafminers, galls and fungi

Uromyces silphii

Uromyces silphii Arthur, 1907

on Silphium


Aecia yellow, cupulate, on discoloured spots at the underside of the leaves.

spermogonia, aecia

Asteraceae, monophagous

Silphium perfoliatum.

on Juncus

Uromyces silphii on Juncus tenuis

Juncus tenuis, Belgium, prov. Antwerp, Retie, Witte Netevallei, 29.viii.2020 © Carina Van Steenwinkel

romyces silphii: uredinia


romyces silphii: telia


Uromyces silphii: urediniospore


Uromyces silphii: urediniospore


Uromyces silphii: teliospores


Uromyces silphii: teliospore

teliospore with pedicel


Uredinia and telia amphigenous, light and dark brown, respectively. Urediniospores with two pores above the equator. Teliospores one-celled, smooth, wall apically strongly thickened; pedicel at least as long as the spore (up to 35 µm), often deciduous.

uredinia, telia

Juncaceae, narrowly monophagous

Juncus tenuis.


This North American species was first discovered in Central Europe in 1956. The occurrence on Silphium seems not yet to be confirmed in Europe.


Beenken & Senn-Irlet (2016a), Brandenburger (1985a), Dietrich (2013a), Gäumann (1959a) Jage, Kruse, Kummer ao (2013a), Klenke & Scholler (2015a), Kruse (2014a, 2019a), Melzer, Pittoni, Poelt & Scheuer (1984a), Mułenko, Piątek, Wołczańska ao (2010a), Poelt & Zwetko (1997a), Termorshuizen & Swertz (2011a), Woods, Stringer, Evans & Chater (2015a).

Last modified 1.ix.2020