PLATE 115. 

 A leaf of Rosa canina Linn. 



(Three-fourths nat. size.) 

 Galled by 



Rhodites rosae Htg. 



The specimen illustrated on the opposite page is the average 

 size of mature growth. It clearly shows the manner in which 

 a leaf is almost entirely absorbed in the formation of the cells 

 and the fibres which surround them. The purpose of these 

 fibres is unknown. As a protection against parasites they are 

 of no use ; seven species at least are known to attack these 

 galls, while other small creatures, principally lepidopterous, 

 pupate amongst them. The fibres show well-defined vegetable 

 structure, and have the power of throwing out branchlets ; 

 this being the case, they are considered to represent leaves 

 which have been developed with scarcely any parenchyma 

 between their fibro-vascular bundles. 



The illustration is of specimens gathered at Guestling, 

 near Hastings, by the author. 



