CATALOGUE OF BRITISH PLANT-GALLS 225 



Diptera On the stem. A gall composed of hypertrophied imbri- 

 cated leaves, reddish below, glabrous and shming, with a 

 central cavity containing a yellow larva. 



Cecidomyia sp. 676 

 Trail, 1878, 1885. Houard, No. 4571. 



Vaccmium Myrtillus Linn. loi. Whortleberry. 

 Fungi Red or purplish swollen spots on the leaves, which are 



variously deformed ; also elongated fusiform swellings on 

 the stems. 



ExoBASiDiUM VACCiNii Wor. 677 

 Connold, Plant Galls, fig. g6. Massee, Brit. Fung. 677a 

 Flora, i., io8. 



OLEACEAE 



Fraxinus excelsior Linn. 109. Common Ash. 

 Diptera Circular pustulesj 6 to 8 mm. in diameter in the leaf 

 parenchyma, not very pronounced ; tinted green or yellow- 

 ish-green, with an irregularly rounded opening on the 

 inferior surface. The gall falls away at maturity, leaving 

 a hole with a brown border in the leaf. 



Dasyneura fraxinea Kieifer 678 

 Trail, 1886, p. 108 ; i888, p. 24. Houard, No. 4647. 



,, On a petiole, or more frequently on the midrib, of a 



leaflet. Elongated pouch-like galls, opening by a slit on the 

 upper surface in September. Tinted with reddish-brown 

 or purple. Larvae orange-coloured, gregarious. M. E. 679 



Perrisia fraxini Kieffer 680 

 Connold, Veg. Galls, pi. 93 ; Plant Galls, fig. 33 ; as 

 caused by Diplosis botularia Wtz., which is, however, only 

 an inquiline. Houard, No. 4644. 



,, Leaflets thickened and hardened, their margins folded 



upwards until, they form a pouch for the numerous white 

 larvae. M. E. 



Perrisia a'crophila Winn. 681 

 Syn. Dasyneura. acrophila Winn. 

 Connold, Plant Galls, p. 244. Houard, No. 4643. 



Homop- Leaf thickened, loosely rolled inwards, greenish-yellow, 

 tera tinted, and streaked with red and purple. Usually the 

 blade on one side of the midrib only is affected; rarely 

 both, niargins are rolled. (Plate XII. i.) 



PSYLLOPSIS FRAXINI Linn. 682 



Connold, Veg. Galls, pi. 74 ; Plant Galls, fig. 34, as 

 caused by Phyllocopies fraxini Nalepa. Houard, No. 4641 . 

 15 



