Ixiv PROCEEDINGS OF THE ROYAL HORTICULTURAL SOCIETY. 



Plant Diseases. — Dr. William G. Smith reports as follows on 

 the specimens submitted to him : — 



Pceonia Disease. — From a further specimen of this 

 disease I have confirmed my previous opinion. The latest 

 specimen sent bore the fructifications of a fungus which I 

 hope to have identified. The diseased tissues contain 

 abundant mycelium, and the starting point for attack was 

 from last year's old wood. I shall be glad to communicate 

 further results later. 



Begonia Leaves. — From the material sent by Mr. Caddy 

 it was difficult to say really what was the cause of disease. 

 One or more fungi were easily developed on the wither- 

 ing leaves, but whether these were saprophytic on the dying 

 tissue or were the cause of the trouble, it is not safe to say. 

 Begonias of this class are so liable to wither at the margins 

 (from draughts, &c), and are so unsuitable for transit to a 

 distance, that accurate observation can only be made on 

 plants in their actual habitat. 



Fungus on Thuya {Biota). — The plants sent were 

 attacked by Pestalozzia funerea, Desm., a fungus well 

 known to occur on dying Thuyas and allies. The life- 

 history is, however, imperfect. 



Cytisus Adami. — Mr. Herbert E. Brooks sent specimens of 

 the curious Cytisus Adami, a well-known "graft hybrid," as it 

 is supposed to be, for M. Adam budded C. purpureus on C. La- 

 burnum in 1825. The purple and yellow flowers are of the 

 true species, but the brick-red flowers are from the hybrid. It 

 was described in the " Gardeners' Chronicle," 1841, pp. 325, 336 ; 

 1842, p. 397, and often subsequently. The fullest account is in 

 Braun's "Rejuvenescence," 1851 (English translation, 1853) ; 

 in Prof. Morren's paper in the " Belgique Horticole," 1871 ; and 

 a summary of the whole subject is given in Darwin's " Varia- 

 tion of Animals and Plants," vol. i., ed. 2 (1875), p. 413. 



Scientific Committee, June 28. 

 Dr. M. T. Masters, F.R.S., in the Chair. 

 Pyrethrum Flowers Arrested. — Mr. E. Ballard sent some 

 flowers, " taken from healthy roots, full of bloom, but on which 



