BRITISH GALLS 
180 
Polygonum aviculare Linn. in. Common Knot¬ 
grass. 
Lepidop- Buds swollen, conical or fusiform swelling at the ex 
tera tremity of the twig amongst the terminal leaves ; tinted 
red, sometimes 15 mm. long and 3 mm. thick. Each gall 
contains a green caterpillar. (Plate VII. 1.) 
Augasma aeratella Zell. 319 
Syn. Asychna aeratella Zell. 320 
Connold, Plant Galls, p. 145. Houard, No. 2153, 2154. 
Polygonum hydropiper Linn. 105. Biting Persicaria. 
Fungi Inflorescence swollen. See No. 318. 
Ustilago utriculosa Nees 321 
Plowright, p. 280. 
Polygonum persicaria Linn. 112. Spotted Persicaria. 
,, Inflorescence swollen. See No. 318. 
Ustilago utriculosa Nees 322 
Plowright, p. 280. 
Polygonum lapathifolium Linn. 103. Pale-flowered 
Persicaria. 
•• Inflorescence swollen. See No. 318. 
Ustilago utriculosa Nees 323 
Plowright, p. 280. 
Polygonum amphibium Linn. 108. Water Persicaria. 
Diptera Flowers deformed. Leaf margins rolled inwards, 
slightly serrated, much swollen and contorted; brightly 
coloured, orange, red, or purple. Larvae gregarious, red. 
M. G. 
PERRISIA persicariae Linn. 324 
Syn. Dasyneura persicariae Linn. 325 
Connold, Veg. Galls, pi. 82. Plant Galls, fig. 246. 
Houard, No. 2157, 2159. 
Polygonum bistorta Linn. 74. Snakeweed. 
Fungi Thickened hemispherical spots on the leaves, containing 
the dark violet teleutospores. July and August. 
Ustilago bistortarum D. C. 326 
Syn. Tilletia bullata Fckl. 
Plowright, p. 277. 
Fagopyrum sagittatum Gilib. (esculentum Moench). 
Buckwheat. 
Nematoda Stems swollen and twisted, internodes shortened and 
thickened, leaves often hypertrophied. 
Tylenchus devastatrix Kuhn 327 
Connold, Plant Galls, p. 244. Houard, No. 2175. 
