Microbotryum marginale (de Candolle) Vánky, 1998
on Bistorta
Bistorta officinalis, England, Vice County: Derby, VC57 © Malcolm Storey, BioImages
open sori
spores
Bistorta officinalis, Belgium, prov. Liège, Bullange, RN de la Vallée de la Schwalm © Stéphane Claerebout
locally the leaf margin is rolled inwards
gall
1-2 mm large grey pustules along the leaf margin, generally so numerous that they coalesce into a continuous ridge; with the epidermis ruptures a brownish- to blackish-violet mass of spores is released.
host plants
Polygonaceae, narrowly monophagous
Bistorta officinalis.
synonyms
Ustilago marginalis (de Candolle) Léveillé, 1849; Bauhinus marginalis (de Candolle) Denchev, 1997.
references
Almaraz (1998a), Brandenburger (1985a: 86), Dauphin & Aniotsbehere (1997a), Klenke & Scholler (2015a), Kruse (2019a), Redfern & Shirley (2011a), Scholz & Scholz (2013a), Spooner & Legon (2006a), Vánky (1994a).