Aurinia, basket of gold

fam. Brassicaceae

1a mine full depth; larva wiyh chitinised head => 2

1b mine lower- or upper-surface; larva a magot => 3

1c fleck mine; opening irregular and relatively large: Apterona helicoidella

1d galls, etc => 100

2a small blotch mine; larva with prolegs; older larva lives free: Plutella xylostella

2b irregular corridor; larva, without prolegs, mines all its life: Ceutorhynchus minutus

3a blotch: Phytomyza alyssi

3b corridor => 4

4a corridor pinnately branched, branches overlying midrib and side veins; pupation outside the mine: Liriomyza strigata

4b corridor not pinnate, not associated with leaf venation; pupation within the mine in a, usually lower-surface, pupal chamber: Chromatomyia horticola

100a Nematoda => 101

100b Acari => 102

100c Coleoptera => 103

100e Diptera => 104

100f Hemiptera => 105

100d Hymenoptera => 106

100g rust fungi => 107

100h smut fungi => 108

100i powdery and downy mildews => 109

100j other causers => 110

104 – Diptera

104a Cecidomyiidae: Dasineura auriniae

109 – powdery and downy mildews

109a Erysiphaceae: Erysiphe cruciferarum

109b Peronosporaceae: Hyaloperonospora galligena

110 – other causers

110a Fungi, Albuginaceae: Albugo candida

110b Fungi, Plasmodiophoraceae: Plasmodiophora brassicae

Aurinia saxatilis has in the past been placed in the genera Aethionema and Alyssum. Have a try there, if the key above does not lead to a result.