Plant Parasites of Europe

leafminers, galls and fungi

Protomyces pachydermus

Protomyces pachydermus von Thümen, 1874

on Taraxacum

Protomyces pachydermus on Taraxacum officinale

Taraxacum officinale, Belgium, prov. Antwerp, Mol, 25.iv.2020 © Carina Van Steenwinkel: infected leaf

Protomyces pachydermus on Taraxacum officinale

same leaf, underside, showing the locally swollen midrib

Protomyces pachydermus: spores

spores (“ascogenous cells”) in the tissue of the midrib

Protomyces pachydermus: ascognous cells

stronger magnification

Protomyces pachydermus: ascognous cells

The size was 26-50 µm.

Protomyces pachydermus: gall on Taraxacum officinale

Taraxacum officinale © Roelof Jan Koops


Diffuse, spindle-shaped swellings of the midrib, sometimes also the pedicel. The gall is somewhat vitreous, shiny, yellowish green at first, later often purplish. Fungus spores are formed in and around the vascular tissue.

host plants

Asteraceae, monophagous

Taraxacum officinale.


see also Protomyces picridis


Bacigálová (2004a), Bacigálová, Mułenko & Wołczańska (2005a, 2008a), Blumer (1946a), Brandenburger (1985a: 663), Buhr (1965a), Dauphin & Aniotsbehere (1997a), Ellis & Ellis (1997a), Jage, Scholler & Klenke (2010a), Klenke & Scholler (2015a), Koops (2013a), Kruse (2019a), Reddy & Kramer (1975a), Redfern & Shirley (2011a), Roskam (2009a)

Last modified 28.xi.2022