Microbotryum flosculorum (de Candolle) Vánky, 1998

on Knautia, Succisa

Microbotryum flosculorum on Knautia arvensis

Knautia arvensis, England, Vice County: Berks, VC22 © Malcolm Storey, BioImages

the anthers are filled with spores

Microbotryum flosculorum: spores

spores

Microbotryum flosculorum: galls on Succisa pratensis

Succisa pratensis, Belgium, prov. Namur, Roly © Sébastien Carbonnelle

opened flowers

gall

the anthers are transformed into a purplish-brown powdery mass of spores. Spores 12-16 x 14-18 µm. The infection is systemic.

host plants

Caprifoliaceae, narrowly oligophagous

Knautia arvensis, dipsacifolia; Succisa pratensis.

synonyms

Bauhinus flosculorum (de Candolle) Denchev, 1997; Ustilago flosculorum (de Candolle) Fries, 1832.

references

Ainsworth & Sampson (1950a), Brandenburger (1985a: 600), Buhr (1964b), Klenke & Scholler (2015a), Kruse, Thiel, Frauenberger ao (2019a), Lutz & Vánky (2009a), Mayor (1967a, 1975a), Redfern & Shirley (2011a), Spooner & Legon (2006a), Vánky (1994a).