GALLS CAUSED BY MITES 
IOI 
hitherto unobserved in Britain. The leaf stalks, the mid¬ 
rib, and the larger lateral veins, were swollen, especially the 
midrib (Plate XXVIII.), 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 Eriopliyes convolvuli , 
hitherto recorded only from Central Europe. It may be 
noted that a very similar gall is caused on this plant by 
Phyllocoptes convolvuli 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 
Eriopliyes enanthus. Its gall has been recorded from Northern 
and Central Europe, also France and Italy. 
Walnut leaves are sometimes galled by Eriopliyes 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 
