Plant Parasites of Europe

leafminers, galls and fungi

Ustilago filiformis

Ustilago filiformis (Schrank) Rostrup 1890

on Glyceria

Ustilago filiformis on Glyceria maxima

Glyceria maxima, Belgium, prov. Antwerp, Balen, Griesbroek © Carina Van Steenwinkel

Ustilago filiformis on Glyceria maxima

sori with intact and ruptured epidermis

Ustilago filiformis on Glyceria maxima

the spore mass looks blackish brown…

Ustilago filiformis: spores

… but under the microscope the 5-7 µm large, smooth spores appear hyaline


Sori form long, dark parallel striae over the leaves, sometimes also the sheaths and culm; they contain an olive-brown, powdery mass of spores. Spores 3-6 µm, smooth. The fungus is systemic; infected plants usually do not flower.

host plants

Poaceae, monophagous

Glyceria arundinacea, declinata, fluitans, lithuanica, maxima, nemoralis, notata.

Losa España reports the species also from Catabrosa aquatica; in the illustration he presents the spores are in irregular clumps, what reminds of Jamesdicksonia dactylidis, but the size of the spores clearly points to filiformis.


Ustilago longissima (Sowerby) Meyen, 1841.


Ainsworth & Sampson (1950a), Almaraz (1998a), Astiz Gasso, Lovisolo & Perelló (2015a), Brandenburger (1985a: 764), Buhr (1964b), Chevassut (1992a), Doppelbaur & Doppelbaur (1973a), Gönczö & Révay (1981a), Jage, Klenke, Kruse ao (2016a), Jage, Kruse, Kummer ao (2013a), Jage, Scholler & Klenke (2010a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2019a), Losa España (1942a, 1944a), Lutz & Vánky (2009a), Savchenko & Heluta (2012a), Scholler & Schubert (1993a), Scholz & Scholz (2013a), Tomasi (2014a), Tóth (1994a), Vanderweyen & Fraiture (2014a), Vánky (1994a), Vánky & Abbasi (2013a), Woods, Chater, Smith ao (2018a), Zwetko (1993a).

Last modified 9.xii.2022