CATALOGUE OF BRITISH PLANT-GALLS 179 



Diptera 



Homop- 

 tera 



Fungi 



Diptera 



Homop- 

 tera 



UBTICACEAE 



XTrtica dioica Linn. 112. Great Nettle. 



Unilocular, rounded, greenish-white swelling, 3 to 8 mm. 

 in diameter, usually at the base of the leaf, with an 

 elongated aperture on the upper surface ; becoming violet 

 at maturity. Sometimes occurring on the stem and the 

 flower stalks. Larva white. M. E. 



Perrisia URTICAE Perris 312 



Syn. Dasyneura urticae Perris. 



Connold, Veg. Galls, pi. 90; Plant Galls, fig. loi. 

 Houard, No. 2095. 



At the extremity of a branch. A bunch of leaves with 

 involuted margins. 



Aphis urticae Fabr. 313 

 Buckton, ii., 50. Houard, No. 2094. 



Leaves deformed and curled. 



Trioza urticae Linn. 314 

 Connold, Plant Galls, fig. 162. Houard, No. 2097. 



Elongated swellings on the stems, with much thickening 

 and distortion. The orange-yellow aecidiospores appear 

 on roundish yellow spots thereon, also on theleaves. May 

 and June. (Plate XVI. 2.) 



Aecidial stage of Puccinia caricis Schum. 315 



Syn. Aecidiuni urticae D. C. 



Plowright, p. 169. Connold, Plant Galls, p. 257. 



Urtica urens Linn. 108. Small Nettle. 

 Swellings at the base of the leaf. See No. 312. 



Perrisia urticae Perris 316 

 Houard, No. 2099. 



Leaves crumpled and deformed. 

 Houard, No. 2100. 



Trioza urticae Linn. 317 



FOLYaONACEAE 



Polygonum convolvulus Linn. 31. Black Bindweed. 

 Fungi Blossom swollen, containing the dark violet mass of 



teleutospores. June to September. 



UsTiLAGO UTRICULOSA Nees 318 

 Syn. UsHlago utriculosa Tulasne. 

 Plowright, p. 280. 



