Peronospora pulveracea Fuckel, 1863

on Helleborus

Helleborus foetidus, Belgium, prov. Liège, Aywaille, Carrière de la Falize, 16.vi.2018 © Carina Van Steenwinkel

the infection is systemic, the entire plant is disfigured

dons

conidiophore

gall

leaves abnormally small, disfigured, spoon-like, upperside clearly discoloured; at the corresponding underside a grey-olive – copper-coloured fungal down, consisting of erect, distally repeatedly dichotomously branched conidiophores. The conidia are egg-shaped. The fungus is systemic and hibernates in the rhizome.

host plants

Ranunculaceae, monophagous

Helleborus dumetorum, foetidus, niger, odorus, purpurascens, viridis & subsp. istriacus.

synonyms

Peronospora hellebori-purpurascentis Săvulescu & Rayss, 1935.

references

Belbahri, Calmin, Pawlowski & Lefort (2005a), Brandenburger (1985a: 146), Buhr (1964b), Doppelbaur, Huber & Poelt (1965a), García-Blázquez, Constantinescu, Tellería & Martín (2007a), Göker, García-Blázquez, Voglmayr ao (2009a), Göker, Voglmayr, Riethmüller ao (2003a), Gustavsson (1991a), Jage, Klenke, Kruse ao (2017a), Jage, Kruse, Kummer ao (2013a), Klenke & Scholler (2015a), Kruse (2019a), Kruse, Thiel, Klenke, ao (2022a), Müller & Kokeš (2008a), Negrean (1995a, 1996b), Riethmüller, Voglmayr, Göker ao (2002a), Săvulescu (1948a), Scheuer & Bechter (2012a), Tomasi (2014a), Voglmayr (2003a).