12 British Vegetable Galls 



soon turns black. Asplwndylia pimpeniella is at first a pale 

 green, upon which, as it changes to a much darker shade, 

 pink stripes appear ; these stripes deepen in colour before 

 maturity of growth is reached. The galls on the leaves 

 of Acer pseudo-platanus caused by Phyllocoptes acericola, and 

 Eriophyes macrorliyncus on Acer canipcsti-e, are very attractive. 

 At first greenish yellow, they pass through yellow, orange- 

 yellow, red, crimson, purple, and finally brown. Those caused 

 by Cecidomyia persicarice are very beautiful. The rolled and 

 thickened margins of the leaves of Polygonum ampJiibiuiii are 

 a much paler green than the other portion of the leaf, and 

 are suffused with pink and purple, which does not change 

 until the leaf withers. Those of Tetranenra ulmi are 

 also very attractive, standing upright upon the rich green 

 Elm leaf. The colours of this pedunculated, pyriform gall are 

 pale yellow at base, with pink gradually taking its place 

 higher up, and a bright crimson at the apex. Aulax glecliojiicB 

 is another charming growth. The bright pink or red globular 

 galls are clothed with long, slender, whitish hairs, and when 

 seen nestling among the beautiful green leaves of Gleclioma 

 hederacea on a wood-side bank, they never fail to excite 

 admiration. The exquisite delicacy of the stems and leaves 

 of Potentilla tormentilla is more apparent when numbers of 

 the pretty little globular or reniform galls caused by the larva; 

 of Xestophattes brevitarisis adorn them. At first pale green, 

 they quickly assume a pink tinge, which changes to nut-brown 

 when mature. The larvas of Nematiis bellus cause some delicate 

 globular or conical sessile galls on the under surface of leaves 

 of Salix Caprea. At first they are pale green, then greenish 

 yellow, upon which red or reddish brown spots appear, and 

 the surface, sometimes glabrous, sometimes sparsely clothed 

 with delicate whitish hairs, produces a pretty contrast against 

 the beautiful green of the leaf. Few galls, however, equal 

 in attractiveness and beauty those caused by the larvse of 

 Rlwdites rosce. From the surface of the conglomerated cells 

 a dense covering of long, many branched, hair-like bristles 

 proceed. These beautiful green, pink, and crimson hair-like 

 or moss-like masses produce an unmistakable and unique 

 appearance. No collection of galls is complete without speci- 

 mens of this most familiar example. 



