ROSACEAE 



201 



Diptera Leaves distorted, midrib swollen. See No. 479. 



Perrisia plicatrix H. Low 490 

 Houard, No. 3025.- 



Fragaria vesca Linn. iii. Wild Strawberry. 

 Nematoda Stem deformed, much swollen, with numerous buds. 

 The abnormal branches are much enlarged, sometimes 

 fasciated, often remaining separated, and the plant then 

 resembles a small cauliflower. Leaves more or less de- 

 formed, with one lobe instead of three. The parasites 

 swarm in the tissues. April to Stptember. 



Aphelenchus fragariae Ritz.-Bos 491 

 Connold, Plant Galls, fig. 287. Houard, No. 3055. 



,, Gall superficially resembling the preceding, but the 



thickened parts of the stem are white, the leaves are 

 somewhat yellowish, and the roots not so abundant. The 

 eelworms live between the sheaths and the stem. 



Aphelenchus Ormerodis Ritz.-Bos 492 

 Houard, No. 3056. 



Fotentilla erecta Hampe. 1 12. Common Tormentil. 

 Hymen- Ovoid or spherical swellings on the stem, rarely on a 

 optera petiole, consisting of a single cell or numerous larval 

 cells which never become fused. Greenish-yellow, red- 

 dish or purple. 



Xestophanes brevitarsus Thoms. 493 

 Syn. Xestophanes tormentillae Cam. 

 Connold, Veg. Galls, pi. 43; Plant Galls, fig. 295. 

 Houard, No. 3064. 



PotentiUa reptans Linn. 99. Creeping Cinquefoil. 



Rounded swellings on the stem, sometimes in a bud, 

 singly, about the size of a pea, forming a long fusiform 

 swelling when coalescent ; the surface cracks at maturity. 

 Each cavity contains a single larva. M. G. Imago, May 

 or June, IL 



Xestophanes potentillae Retz 494 



Syn. Aulax splendens Hartig. 



Connold, Veg. Galls, pis. 13, 14, 129* ; Plant Galls, 494^ 

 fig. 92. Houard, rios. 3060, 3061. 



PotentiUa argentea Linn. 57. Hoary Cinquefoil. 

 Rounded or fusiform swelling on the stem, surface 

 usually mammillated ; plurilocular. . 



Diastrophus Mayri Reinhard 495 

 Connold, Plant Galls, p. 246. 



