? op Scrophularia vernalis

on Scrophularia

? on Scrophularia vernalis

Scrophularia vernalis, ‘s-Gravenzande © Jan Scheffers

? on Scrophularia vernalis

burst stem

? on Scrophularia vernalis

the plant is strongly disfigured

? on Scrophularia vernalis

over a large surface the epidermis is shining black

? on Scrophularia vernalis

infestation to a lesser degree also on the underside of the the leaves

gall

The general aspect of the infection strongly reminds to the description of Uromyces scrophulariae. However, the blackened aspect was not caused by telia, but by a black discolouration of the epidermis. Microscopical study excluded any rust fungus.

21/06/2015

mod 23.vii.2017