Plant Parasites of Europe

leafminers, galls and fungi

Microbotryum kuehneanum

Microbotryum kuehneanum (Wolff) Vánky, 1998

on Rumex

Microbotryum kuehneanum on Rumex acetosella

Rumex acetosella, Belgium, prov Limbourg, Heppen, Gerheserheide, 29.v.2022 © Carina Van Steenwinkel

Microbotryum kuehneanum on Rumex acetosella

advanced infection

Microbotryum kuehneanum on Rumex acetosella


spores 12-16 x 12-17(-18) µm, incl. ornamentation


the flowers, generally all flowers of a plant, are transformed into a blackish-purple mass of spores. Also low purplish-brown blisters on the leaves and petioles.

host plants

Polygonaceae, narrowly monophagous

Rumex acetosella.


Ustilago kuehneana Wolff, 1874.


Ainsworth & Sampson (1950a), Almaraz (1998a), Brandenburger (1985a: 91), Buhr (1965a), Klenke (2002a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Redfern & Shirley (2011a), Spooner & Legon (2006a), Van Steenwinkel & Fraiture (2023a), Vanderweyen & Fraiture (2014)a), Vánky (1994a).

Last modified 3.vii.2023