NEW BRITISH PLANT GALLS 29 



HiPPOPHAE EHAMNOiDES. MassGS of tubercles on the roots, 

 sometimes attaining 5 cm. in diameter. Dark grey at first, darker 

 near the base, which in old specimens is dark brown or almost 

 black. Similar galls occur on the roots of Alnus rotundifolia, and 

 in the catalogue (No. 210) are associated with Frankiella alni ; 

 but according to Miss Ethel E. Spratt " the overgrowths are 

 produced by root infection of the nitrogen-fixing organism Pseudo- 

 monas radicicola, "a polymorphic organism, the bacillus and coccus 

 being different forms of one and the same organism." North 

 Wales, Miss E. E. Spratt, 1912. (Familv Elaeagnaceae, to follow 

 No. 640.) 



Galium verum. Leaf margins rolled and bent. Caused by 

 Eriophyes galii. (See No. 766.) Penshaw, E. Bagnall, 1915. 

 Terminal leaves swollen and bunched. Caused by Perrisia 

 galiicola. (See No. 753.) Penshaw, E. Bagnall, September, 

 1915. 



Galium Mollugo. Leaf margins rolled and bent. Caused by 

 Eriophyes galii. Newton Abbot, E. W. Swanton, July, 1915 ; 

 and Penshaw, E. Bagnall, August, 1915. 



Galium saxatile. Leaf margins rolled and bent. Caused by 

 Eriophyes galii. Penshaw, E. Bagnall, x\ugust, 1915 ; and 

 Haslemere, E. W. Swanton. 



HiERACiUM umbellatum. Prouounced globular swelling on 

 the stem, usually near the apex. Caused by Aulacidea hieracii. 

 (See No. 866.) Haslemere, E. W. Swanton, September, 1915. 



FEEDEEICK HAMILTON DAVEY. 



By the death of Frederick Hamilton Davey, which took 

 place, after a long and painful illness, at his residence at Perran- 

 well, Cornwall, on September 23rd of last year, at the early age 

 of forty-seven, British botany has been deprived of one who was 

 not only an enthusiastic and careful worker, but the author of one 

 of the best of our more recent local floras. Always fond of wild 

 flowers, it was not until 1889 that, at the suggestion of the late 

 Mr. A. O. Hume, who subsequently materially assisted in the pro- 

 duction of the work, Davey devoted himself to the study of 

 Cornish plants with a view to the publication of a flora. His 

 first contribution on the subject appeared in this Journal (1900, 

 p. 354), in whose pages numerous notes from his pen have been 

 published. The most important of these was the description of 

 a new Euphrasia, named in compliment to Dr. C. C. Vigurs, his 

 friend and collaborator, which appears, with a plate, in this 

 Journal for 1907 (p. 217). Another of his interesting Cornish 

 discoveries was a variety of Polygala serpyllacea which was 

 named by Dr. Chodat vincoides (Journ. Bot. 34, 1906). 



* " The Morphology of the Root Tubercles of Alnus and Elasagnus. and 

 the Polymorphism of the Organism causing their Formation," Annals of 

 Botany, vol. xxvi, no. ci, January, 1912. 



