Dichotomous table for gallers on Torilis
by Hans Roskam
1a Malformations on inflorescences or their parts, or fruit galls => 7
1b Malformations on leaves or stems => 2
2a Leaves with expanded malformations => 4
2b Vitreous bulges or pads bearing fruiting bodies on leaves, -stalks, or on stems => 3
3a Spindle-shaped, vitreous bulges on basal stem part, on petioles, midrib and leaf veins. T. japonica: Protomyces macrosporus
3b Bulges yellowish, soon bearing aecia, on the axis of leaves, also on younger stem parts. T. arvensis & subsp. neglecta, japonica, nodosa: Uromyces lineolatus
3c T. japonica has furthermore been indicated as host for Puccinia chaerophylli
4a Malformations caused by aphids or spittlebugs => 5
4b Tip of leaflets variously rolled or strongly curled. T. arvensis, japonica: Aceria peucedani
5a Malformations caused by aphids => 6
5b Main- and side midrib, together with ± curled leaflets, strongly deflected; usually with several similarly disfigured leaves changed into a nest-like cluster. T. arvensis, japonica: Philaenus spumarius
6a ip of leaflet at first with small, upwardly open folds; causer also in ± swollen leaf sheaths. The side shoots that develop later in these sheaths curled; the umbels ± greened and/or leafy. T. arvensis, japonica: Hyadaphis foeniculi
6b Leaflets densely clustered on ± shortened midrib, disfigured; leaf blades irregularly deflected, twisted, curled and ± bulging. T. arvensis, japonica: Semiaphis anthrisci
7a Extensive malformations on inflorescences => 9
7b Localised galls on fruits or stalks of inflorescences => 8
8a Centre of umbel or stalk of umbel ± swollen, club-shaped. Inner wall, rough, covered with mycelium. Containing a single red larva. T. japonica: Lasioptera carophila
8b Fruit inflated, bladder-like; ± globular or flattened on one side, oblong-oval. Gall thin-walled sometimes reddened, protruding above the umbel. Containing 1 (–3) orange-red larvae. T. japonica: Kiefferia pericarpiicola
9a (Partial) umbels severely stunted; ± ball-like clustered; aphid galls => 10
9b Flowers in umbel clustered with umbel stalk often little stunted, variously leafy or only partially greened. T. arvensis, japonica: Aceria peucedani
10a Stalks of umbels and flowers often variously stunted, resulting in irregularly stunted parts. Flower bud disfigured, often mostly greened or even leafy. T. arvensis, japonica: Semiaphis anthrisci
10b Similar malformations. T. japonica: Cavariella pastinacae