Thecaphora seminis-convolvuli (Desmazières) Ito, 1935

on Calystegia, Convolvulus

Thecaphora seminis-convolvuli: galled seeds of Calystegia sepium

Calystegia sepium, England, Berks, VC 22 © Malcolm Storey, bioImages

Thecaphora seminis-convolvuli: galled anthers of Calystegia silvatica

Calystegia silvatica, England, Berks, VC 22 © Malcolm Storey, bioImages. This is the anamorphic stage of the infection, when conidia are formed.

Thecaphora seminis-convolvuli on Calystegia sepium

Calystegia sepium, Belgium, prov. Flemish Brabant, Zichem, de Demerbroeken © Carina Van Steenwinkel: galled seed, opened

Thecaphora seminis-convolvuli: spore balls

spore balls

Thecaphora seminis-convolvuli: spore balls

detail

Thecaphora seminis-convolvuli (?):  conidium

conidium, possibly of the anamorph of this fungus

gall

flowers small, anthers swollen; contents of one or more seeds in the capsule is transformed into a granular-powdery reddish brown mass of spores.

host plants

Convolvulaceae, narrowly oligophagous

Calystegia sepium, silvatica, soldanella; Convolvulus arvensis.

notes

Malcolm writes on his site: “This smut may be found either by searching for flowers with swollen anthers, or by bursting the ripe capsules with your fingers, from late August onwards and looking for dark dusty seeds. Beware that the large ripe seeds are black and when half-ripe they can look as though they are covered in dust, but a true infection will produce copious spore dust from large lesions on the seeds. Infected host flowers stay open into the evening after uninfected flowers have closed for the night.”

references

Ainsworth & Sampson (1950a), Buhr (1964b), Dauphin & Aniotsbehere (1997a), Jage, Klenke, Kruse ao (2016a), Klenke & Scholler (2015a), Kruse (2019a), Kruse & Jage (2014a), Kruse, Kummer, Shivas & Thines (2018c), Redfern & Shirley (2011a), Savchenko & Heluta (2012a), Scholz & Scholz (2013a, Tomasi (2012a, 2014a), Vanderweyen & Fraiture (2014a), Vánky (1994a), Vánky, Lutz & Bauer (2008b), Woods, Chater, Smith ao (2018a).

mod 1.ix.2019