NEW BRITISH PLANT GALLS 25 



PoPULUS TREMULA. Bucls greatly hypertrophied, forming 

 green or reddish globular cauliflower-like masses, sometimes 

 attaining one inch in diameter. Caused by Eriophyes populi. A 

 verv distinctive gall sent by Mr. W. Watt from Forres, September, 

 1913. (To follow No. 178.) 



Cerastium vulgatum. Pods slightly curved and swollen, 

 containing orange-coloured larvae. Caused bv Perrisia fructmcm. 

 Marton, Yorkshire, E. Bagnall, 1915. (To follow No. 348.) 



Ononis repens. Flowers transformed into a mass of very 

 small and almost sessile leaves covered with long white hairs. 

 Caused by Eriophyes ononidis. Sent by Mr. J. Eayner from 

 Southampton, July, 1915. (To follow No. 560.) 



Tripoli QM repens. Petioles and nerves swollen and dis- 

 torted. Caused by Uromyces flectens. See British Bust 

 Fungi, p. 92, W. B. Grove, 1913. 



Lathyrus montanus. Leaflets slightly swollen and rolled in 

 a cylindrical manner, the roll containing pinkish larvae. Caused 

 by Perrisia Schlechtenclali. From Birtley, co. Durham, E. 

 Bagnall, 1915. (To follow No. 596.) 



(N.B. — An error occurs on p. 214 of British Plant Galls. 

 The gall No. 595 is there associated with Vicia septum instead of 

 Lathyrus pratensis, through the omission of a line w^iich should 

 have read "Lathyrus pratensis Linn. 112. Meadow Vetchling.") 



Acer campestre. A felt of minute hairs on either (or both) 

 of the leaf surfaces. It is w^hite at first, becoming brown or 

 reddish, and does not occur at the nerves. Caused by Eriophyes 

 macrochelus var. erinea. In abundance at Newton Abbot, 

 S. Devon, July, 1915, B. W. Swanton. (To follow No. 608.) 



EuoNYMUS EUROP^us. Leaf margin rolled and discoloured, 

 sometimes purplish ; the rolled part covered with a felt of minute 

 hairs. Caused by Eriophyes convolvens. Newton Abbot, 1912, 

 Mr. Samuel Mason. (To follow No. 602.) 



Geranium lucidum. Leaves tufted, swollen and deformed, 

 with rolled margins. The interior of the roll, and very frequently 

 the adjacent outer surface, is covered with a felt of yellowish- 

 green (sometimes reddish) hairs. Caused by Eriophyes geranii. 

 Abundant at Newton Abbot, 1912, E. W. Swanton. (To follow 

 No. 602.) 



Erodium cicutarium. Flowers swollen, forming oval galls 

 containing the gregarious orange- coloured larvae. Caused by 

 Perrisia geranii. Brindle Bay, Northumberland, and Cowper, 

 Durham, E. Bagnall, 1915. (To follow the above.) 



Tilia vulgaris. Abnormal pilosity in the axils of the 

 nervures on the lower surface of the leaf. The hairs are 

 cylindrical, white, becoming brownish. Caused by Eriop)hyes tilice 

 var. liosoma. Between Allenhead and Allendale, Northumberland, 

 E. Bagnall, 1915. (To follow No. 422.) 



Lythrum Salicaria. Bud modified ; the calyx, shghtly 



