CATALOGUE OF BRITISH PLANT-GALLS 137 



Avena pubescsns Huds. 94. Downy Oat Grass. 

 Fungi Fusiform swelling on the stem. See No. 34. 



Epichloe typhina Persoon 48 



Phragmites communis Trin. 104. Common Reed 

 Diptera Lateral branches shortened, walls of the terminal inter- 

 nodes thickened and hardened. Interior of the haulm 

 filled with a blackish grumous mass in which are reddish- 

 yellow larvae, each living in an isolated and distinct 

 galleiy. 



Lasioptera arundinis Schiner 49 

 Connold, Plant Galls, p. 246. Houard, No. 241. 



" Isolated or grouped growths in the interior of the haulm, 



quite invisible externally. Each is firmly attached to the 

 inner wall, and about 7 mm. long. Surface rough, pale 

 yellow or brown, soft at first, becoming very hard at 

 maturity. Each gall contains a white larva. M. G. 



Perrisia iNCLUSA Frauenfeld Jo 

 Syn. Cecidomyia inclusa Frauenfeld. 

 Connold, Plant Galls, p. 246. Houard, No. 245. 



Terminal fusiform swelling attaining the size of the 

 middle finger. The axis of the stalk is shortened because 

 of the arrested development of from ten to fifteen terminal 

 internodes. The central cavity, 2 to 3 mm. in diameter, 

 50 to 80 mm. long, has very thick and woody walls. It 

 contains a single larva. M. G. 



LiPARA LUCENS Meigen 5 1 



Connold, Veg. Galls, pi. 32 > Plant Galls, fig. 258. 

 Houard, No. 238. 



Small depressions on the upper surface of the leaf, which 

 is often powdered with yellow dust when the Aphides are 

 numerous. Aphis bright green, more or less covered with 

 yellow meal ; cornicles dark grey, very small. 



Hyalopterus arundinis Fabr. 52 



Buckton, ii., 112. Houard, No. 247. 



Oynosurus cristatus Linn. 112. Dog's-tail Grass. 

 Fusiform swelling at the apex of the stem. See No. 34. 



Epichloe typhina Persoon 53 



Poa annua Linn. 112. Annual Meadow Grass. 

 Nematoda Plant bulbous at the base of the stem. 



Tylenchus devastatrix Kiihn 54 

 Connold, Plant Galls, p. 191. Houard, No. 260. 



Fungi Fusiform swelling near the apex of the stem. See 



No. 34. 



Epichloe typhina Persoon 55 

 Massee, Textbook of Plant Diseares, p. 125. 



Homop- 

 tera 



Fungi 



