216 JOURNAL OF THE EOYAL HORTICULTURAL SOCIETY. 



VII. — A Disease of Antibrhinum. 

 By F. J. Chittenden, F.L.S. 



In the summer of this year specimens of diseased Antirrhinums were 

 received at the Laboratory from Devonshire. Nearly every plant in the 

 garden from which they came was diseased, though they were planted in 

 different aspects and in various kinds of soil. 



The leaves of the diseased plants had numerous yellowish rounded 

 spots upon them (fig. 82, a), and in some cases these spots were so numerous 



Fig. 82. — Septoria antirrhini. 



a, Leaf with pale spots (s) produced by the fungus ; b, diseased spot on stem ; 

 c, spores of the fungus. 



(a and b, natural size ; c, much magnified, see scale). 



that the whole leaf was dead. In addition somewhat similar, elongated-oval 

 dead spots were present on the main stem and its branches (fig. 82, b). In 

 some instances the dead areas upon the stem passed quite round it, 

 forming a girdle of diseased tissue, and then all above the diseased spot, 

 being cut off from the water supply from below, died and dried up. The 

 diseased plants therefore presented a very forlorn appearance, failed to 

 flower, and in most cases soon succumbed to the attack. 



The disease proved to be due to the attack of a fungus which has not 

 previously been known to occur in Great Britain, though it is known 

 in parts of Western Europe, having been recorded from France, Italy, 



