CATALOGUE OF BRITISH PLANT-GALLS 155 



Homop- 

 tera 



Fungi 



Lepidop- 

 tera 



Diptera 



Leaf margins bent inwards until they meet, forming a 

 pouch. Aphis pale green, very woolly. Attacked leaves 

 become brightly tinted with red,- and are usually covered 

 with little pustules. Sometimes only one margin is 

 attacked. (Plate XII. 5.) 



PEMPHiaus AFFiNis Kalt. 185 



Buckton, iii., 122. Houard, No. 541. 



Petiole greatly swollen ; the swelling (i S to 30 mm. long) 

 consists of contiguous spiral rolls, which are greenish- 

 yellow at first, then reddish. The large internal cavity 

 contains the Aphides in various stages of development. 

 Aphis pale green, very woolly. Autumnal. (Plate XII. 9.) 

 Pemphigus spirothecae Pass. 



Buckton, iii., 122. Connold, Plant Galls, fig. 248 ; 

 Veg. Galls, pi. 105. Houard, No. 535. 



Bud deformed, making a vesicular gall about the size of a 

 hazel nut with a rounded opening at its apex. It sometimes 

 occurs on the petiole, and commonly on the leaf. Greenish- 

 yellow, becoming tinted with red. Aphis dusky green 

 with fuscous head. (Plate XII. 6.) 



Pemphigus bursarius Linn. 

 Buckton, iii., 117. Connold, Veg. Galls, pi. 104; Plant 

 Galls, fig. 247. Houard, Nos. 523, 529, 533. 



Golden-yellow blisters on the leaf. See No. 164. 



Taphrina aurea Fries. 

 Connold, Plant Galls, fig. 249. Massee, Textbook of 

 Plant Diseases, p. 17. 



BETULACIiAi: 



Betula alba Linn. Aggr. 112. Common Birch. 



Ovoid or rounded swelling of a branch at the nodes, 

 containing a vvhitish caterpillar. 



Epiblkma tetraquetrana Haw. 191 



Syn. Phloeodes tetraquetrana Barrett. 



Connold, Plant Galls, fig. 58 (without name). Houard, 

 No. 1074. 



Roundish pustules, 3 to 4 mm, in diameter, about 2 mm. 

 in thickness, showing equally on both surfaces of the leaf. 

 Solitary or gregarious, seldom coalescent, yellowish-green 

 with a narrow band of red or purple at the margin. Each 

 pustule contains a larva, white at first, then sulphur-yellow. 

 M.E. 



CONTARINIA BETULINA KiefF. 192 



' Connold, Plant Galls, fig. 63 (without name). Swanton, 

 Knowledge, June, 1910. Houard, No. 1076. 



186 



187 

 188 



189 



190 



