372 



JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Honeysuckle Cluster-cups. 

 Mcidium Periclymeni (Schum.). 



Although the cluster-cups are usually found upon uncultivated plants, 

 it is not an uncommon British parasite, and is one of those species to 

 which no Uredo or Puccinia has been affiliated. 



The spots on the leaves are roundish, or oblong, and yellowish, whilst 

 the cups are clustered together on the spots. The cups are somewhat 

 cylindrical, with a fringed white margin. The aecidiospores are roundish, 

 sometimes angular by compression (16-28 /j. diam.), delicately warted, 

 and orange in colour. 



The species is recorded also in France, Belgium, Germany, Switzer- 

 land, Italy, and Siberia. 



Sacc. Syll. vii. 2809 ; Cooke M.F. 196 ; Plowr. Br. Ured. 264. 



Another species [M. lonicerinum) is reported to be found upon the 

 living leaves of a species of Honeysuckle in Asiatic Siberia. 



Honeysuckle Black Blotch. 

 Lasiobotrys Lonicerce (Kunze), PI. III. fig 57. 



This is a peculiar parasite which has been known in this country for 

 many years on living Honeysuckle leaves, although not likely to give 

 much trouble in gardens. The leaves are spotted with several roundish 

 black shining blotches (2-5 m. diam.) 



An external stromatic cup, which ruptures irregularly, encloses a 

 number of black receptacles or perithecia (50 /u diam.) densely clustered 

 together. Each of these perithecia contains a number of club-shaped 

 asci, or membranous sacs, which include the sporidia, eight of which are 

 enclosed in each ascus. These sporidia are shortly fusiform and colour- 

 less (8-10 x 4-5 n), which are set free by the irregular splitting of the 

 perithecia. 



The pustules are sometimes quite round, black, shining, and convex, 

 so that they appear to be superficial, like little spots of pitch on the 

 leaves. 



It is recorded for France, Belgium, Germany, Italy, Algeria, and 

 Siberia. 



It is so rare on Honeysuckle in gardens that the effect of fungicides 

 has not been determined, but they are scarcely to be relied on for so 

 deeply seated an endophyte. 



Sacc. Syll i. 121 ; Cooke Hdbk. 1909. 



Although the powdery mildew (Microsphcetria Ehrenbergn) has been 

 found on Honeysuckle leaves on the Continent, we have no record of it in 

 Britain. 



PESTS OF COMPOSITE PLANTS. 

 It seems rather remarkable that so large an order of plants as the 

 Composite, containing many garden flowers, should be so conspicuously 

 free from the atttacks of fungoid parasites. Who shall explain wherefore 



