BRITISH GALLS 



Myce- Nodular or warty outgrowths on the roots, which become 



tQzoa swollen and clubbed. The well-known ' finget and toe ' 

 dise ise. 



Plasmodiophora brassicae Woronin 381 

 Connold, Plant Galls, p. 227. 



Badicula sylvestris Druce {Nasturtium sylvestre 

 Br.). 64. Yellow Watercress. 

 Diptera Large ovoid spongy swelling at the base of the leaf stalk. 

 Flowers much deformed and swollen, forming a globular, 

 spongy, yellowish mass about 12 mm. across. Larvae 

 yellow, gregarious. M. G. 



Dasyneura sisymbrii Schrank 382 

 Syn. Cecidotnyia sisymbrii Sch. 383 



Connold, Plant Galls, figs. 307, 308. Houard, No. 2648. 



Eadicnla palustris Moench {Nasturtium palustre 

 D. C). 84. Marsh yellow Cress. 

 ,, Inflorescence and stem swollen. June to November. 



See Nos. 382, 383. 



Dasyneura sisymbrii Schrank 384 

 Houard, No. 2652. 



Barbarea vulgaris Ait. 102. Yellow Rocket 

 „ Flower stalks, inflorescence, leaves and petioles, de- 385 



formed and swollen. May and June. See Nos. 382, 383. 386 



Dasyneura sisymbrii Sch. 387 

 Connold, Plant Galls, fig. 326. Houard, Nos. 2640-2643. 388 



Cardamine amara Linn. 76. Large-flowered Bitter- 

 cress. 



On the stem, usually at the base, a unilateral feeble 

 swelling, resulting from hypertrophy of the cortical paren- 

 chyma, containing a larval cavity. Small, and easily over- 

 looked. 



PSYLLIOIDES NAPI Koch 389 



Houard, No. 2673. 



Flowers not opening. Calyx normal ; the unopened 

 corolla consists of green petals with swollen bases, the 

 stamens and filaments shortened and thickened. Larvae 

 red, about six in a gall. M. E. 



Perrisia cardaminis Winn. 390 



Syn. Cecidomyia cardaminis Wtz. 



Inchbald, 1883, p. 194. Houard, No. 2672. 



Cardamine pratense Linn. 112. Cuckoo Flower. 

 Colaop- Irregular axial swelling and elongated distortion of the 



tera stem, very variable in size and shape. The leaf stalk is 



Coleop- 

 tera 



Siptera 



