8 



JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Ivy Brown Spot. 

 Septoria insular is (B. & Br.), PI. XVI. fig. 11. 



This parasite was first recognised by Berkeley as causing large brown 

 spots on languid Ivy leaves in Britain, sometimes occupying a large 

 portion of the leaf. The receptacles are scattered over the spots, raising 

 and afterwards splitting the cuticle. The sporules are long and thread- 

 like, slightly curved, but without division (38 n long). 



Berk. Ann. N. H. No. 747, 1. 15, f. 8 ; Sacc. Syll. iii. 2646 ; Grevillea, 

 x ii. 7 ; Cooke, Hdbk. No. 1308. 



Ivy Ringed Spot. 

 Septoria hederce (Desm.), PI. XVI. fig. 12. 



This is a much more common species than the above, r and forms 

 smaller, almost circular, bleached spots, encircled by a broad purple 

 margin. The receptacles are seated on the upper surface, and the 

 sporules are similarly thread-like (30-40 x 1-2 /u), the difference being 

 chiefly in the character of the spots. 



It has been known in Britain, France, Belgium, Italy, and Germany. 



Sacc. Syll. iii. 2644 ; Grevillea, xiii. 76 ; Cooke, Hdbk. No. 1316. 



Ivy Leaf Anthracnose. 

 Glazosporium paradoxum (De Not.), PI. XVI. fig. 13. 



Of the two species of European anthracnose on Ivy, one has been 

 reported to have been found in Britain. This was apparently first 

 observed in Italy, and occurs on both surfaces of the leaves, without 

 forming any definite spots. The pustules are honey-coloured and 

 flattened, covered by the cuticle. When mature the conidia escape by 

 rupture of the cuticle (8 x 5-6 p), produced in clusters, each supported by 

 a colourless pedicel, which is nearly double the length of the conidia. 



This is reported to be an early and imperfect stage of an asci-bearing 

 fungus, which appears on the dead leaves after they have fallen. 



The species is also known in France, Belgium, Germany,*Portugal, 

 and Italy. 



Sacc. Syll. iii. 3697 ; Cooke, Hdbk. No. 1407, note. 



Another species, which occurs on Ivy, has brownish spots with larger 

 conidia (Glceosporhim helicis), and has been found in France and Holland. 



Myrtle Leaf- spot. 

 Phyliosticta nuptialis (Thiim.), PI. XVI. fig. 14. 



The only parasite on Myrtle which we have yet encountered in this 

 country has been the occurrence, on one or two rare occasions, of the 

 above species. The spots are somewhat rounded and bleached, either 

 white or of a pale ochre, with a broad violet margin showing brown on 



