176 iBRITISH GALLS 



Homop- Leaves folded and bent along the lateral nervures, 

 tera blistered on the upper surface, the depression below con- 

 taining' the woolly Aphides; Aphis bright ^een or 

 yellowish green with large ted eyes ; the cornicles are 

 mere tubercles. 



Phyllaphis fagi Linn, 293 

 Connold, Plant Galls, fig. 346. Buckton, iii., p. 38. 

 Houard, No. 1161. 



Aoari Densely tufted mass of short twigs on the branches and 



on the trunk. Those on the branches sometimes resemble 

 a " witch's, broom." (Plate XIV.) 



? Eriophyes 294 

 Swanton, Haslemere Mus. Gaz., i., p. 534. 



Tufts of short thick hairs, forming more or less rounded 

 spots on the lower surface of the leaf. White at first, then 

 rosy, finally brown. Erineum fagineum Persoon. 

 Eriophyes nervisequus Can., var. maculifer Trotter 295 



Greville, 1827, pi. 250, vol. v, Houard, No. 1164. 



Leaf margin more or less rolled upwards, the interior 

 of the roll lined with hairs. Sometimes the lateral veins 

 are swollen, the leaf folded, covered with abnormal hairs, 

 and tinted with red. Legnon circutnscriptum Bremi. 



Eriophyes stenaspis Nalepa 296 



Connold, Plant Galls, fig. 50. Houard, Nos. 1159, 1160. 297 



.. ' Leaf folded longitudinally, with a mass of abnormal 

 hairs in the axils of the nervures on the lower surface. A 

 discoloured swelling on the upper surface. 



MONOCHETUSSULCATUS. Nalepa 298 

 Connold, Veg. Galls, pi. 72 ; Plant Galls, fig. 53. 

 Houard,_ No. 1163. 



Branches much cankered andhypertrophied; the swell- 

 ings are often tumour-like and large. 



Connold, Plant Galls, figs. 48, 49. Massee, Textbook 

 of Plant Diseases, p. 137. At one time supposed to have 

 been caused by Nectria ditissima ; it is probable that it is 

 induced by Aphides. 



299 



