Ixxxvi PROCEEDINGS OF THE ROYAL HORTICULTURAL SOCIETY. 



also noticed as spreading widely in Africa. Fruit pods of Ceropcgia 

 Woodii were also exhibited, presenting the usual cylindrical narrow form. 



Leaves of Planes. — Mr. Hooper called attention to the singular pro- 

 vision for the protection of the buds at the base of the petiole, and asked 

 for other examples of a similar kind. 



Various diseased Leaves. — Mr. Saunders, F.L.S., exhibited leaves 

 affected by a species of Psylla, box leaves affected with Sijhcertdina Buxi, 

 and violet leaves attacked by Cercospora Violcs. 



The late Prof. Marshall Ward. — On the proposition of the Chairman, 

 it was decided to send a letter of condolence to the widow of Professor 

 Marshall Ward, for many years a valued member of the Committee. 



The late C. B. Clarke. — Reference was also made to the death of 

 this distinguished botanist. 



Scientific Committee, September 25, 1906. 



Mr. G. Massee, F.L.S., V.M.H., in the Chair, and nine members 



present. 



Diseased Iris from Bomsey. — Mr. Massee reported that the disease of 

 Iris referred to him at the last meeting was due to the fungus Iletero- 

 sporium gracile (Saccardo). The best treatment is to spray early in the 

 season with dilute Bordeaux mixture. Other fungicides seem to be of no 

 avail against this fungus. Injured leaves should be cleared away, other- 

 wise there will be a return of the disease next season ; probably even 

 with these precautions the disease will recur. 



Lijury to Chrysanthemum Leaves. — Mr. Holmes, F.L.S., showed 

 leaves of chrysanthemum having pale-brown patches and lines upon 

 them, particularly near the midrib. Mr. Saunders took them for further 

 examination. 



Monthretias dying. — Mr. E. A. Bowles, F.L.S., showed some further 

 specimens of dying Monthretias similar to those shown on August 14, in 

 which the first symptom of trouble is the browning of the leaves. The 

 disease appears to be a physiological one, no specific organism, either 

 animal or vegetable, having been found associated with it. 



Bust on Plum Leaves. — Mr. J. Douglas, V.M.H., showed shoots of 

 plum very badly infested with the plum rust, Puccinia Pruni. No leaves 

 should be allowed to remain on the ground through the winter, as upon 

 these the spores of the fungus hibernate, and the trees should be sprayed 

 with a fungicide in the spring. 



' Wheatear ' Siveet William. — Mr. Douglas also showed on behalf of 

 Rev. W. Wilks an inflorescence of Sweet William, in which all the 

 flowers were malformed as in the ' Wheatear ' carnation, the bracts 

 being repeated again and again at the expense of the flower. 



Black Fiongus on Apple Leaves. — Apple leaves covered by a black 

 sooty material were received from Bramerton, Norwich. The cause of 

 the appearance was the presence of a species of Fumago upon the leaves, 

 a fungus which grows upon the honeydew formed through the attacks of 

 aphis. Attention should be paid to keeping the aphis in check. The 

 variety ' King of the Pippins ' was the one chiefly attacked. 



