Dichotomous table for gallers on Bartsia alpina
by Hans Roskam
1a On parts above ground => 2
1b Woody swelling of root, 20 mm long, 15–18 mm thick. Mirificarma mulinella
2a On leaves => 3
2b Shoot tip ± unopened. Leaves folded, slightly thickened, sometimes erect, enclosing tuft-like severely disfigured leaf- or flower primordia. Cause unknown – ? gall midge
3a Young leaves with slightly swollen folds at base. Cause unknown – ? gall midge
3b Leaf blades rolled downwards at margin, there discoloured yellowish or reddish, externally ± abnormally pubescent. Aceria bartschiae