GALLS CAUSED BY MITES roi 



hitherto unobserved in Britain. The leaf, stalks, the mid- 

 rib, and the larger lateral veins, were swollen, especially the 

 midrib (Plate XXVI IL), forming a pouch with an extended 

 opening on the upper surface. The hypertrophied parts 

 were wrinkled or otherwise distorted, very pubescent within 

 and without, and of a beautiful pinkish-red tint. The mite 

 responsible for this interesting gall is Eriophyes convolvuU, 

 hitherto recorded only from Central Europe. It may be 

 noted that a very similar gall is caused on this plant by 

 Phyllocoptes convolvuU Nalepa in Germany, France, and Italy. 

 There is, however, no abnormal pubescence; the hyper- 

 trophy is less pronounced, of a greenish-yellow tint, never 

 assuming the attractive hue of the other. This gall should 

 be looked for on our southern coasts. 



In the summer of 1910 I found on the Sheep's Bit at 

 Haslemere another gall which is, I think, a new British 

 record. The affected plant at first sight appeared to be 

 merely an abnormally large one, with reddish and velvety 

 involucral bracts. On closer examination I observed that 

 the unopened buds on some of the stems were very hairy, 

 also that a few flower heads were transformed into a bunch 

 of small velvety leaves. The pubescence at once suggested 

 the presence of mites, and they were quickly discovered 

 upon microscopic examination. The Sheep's Bit mite is 

 Eriophyes enanthus. Its gall has been recorded from Northern 

 and Central Europe, also France and Italy. 



Walnut leaves are sometimes galled by Eriophyes tristratus, 

 var. erineus. A description of this gall is given in the cata- 

 logue. It was described by Persoon under the name of 

 Erineum juglandinum. Fossil leaves of a species of Walnut 

 have been found with galls resembling it. 



Galls on Lichens 



According to Zopf (1907), an Eriophyid causes scattered 

 irregular swellings, containing a minute cavity, on the 

 swollen thallus of the lichen Ramalina Kullensis Zopf. This 



