FUNGOID PESTS OF CULTIVATED PLANTS. 183 



smaller sporules (4x1 /u), in France and Belgium, and Phyllosticta 

 concentrica with broad pallid spots, on which the receptacles are disposed 

 concentrically, with sporules which are nearly globose (10 x 8-9 p), only 

 at present recognised in Italy. 



IVY BROWN SPOT. 

 Septoria insularis (B. & Br.), PL 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 /j long). 



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

 xiv. 76 ; Cooke, Hdbk. No. 1308. 



IVY RINGED SPOT. 

 Septoria Hedera (Desm.), PL XVI. fig. 12. 



This is a much more common species than the above, 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 p), 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 ANTHKACNOSE. 

 Glososporium paradoxum (De Not.), PL XVII. 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 yu), 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 (Glososporium Helicis), and has been found in France and Holland. 



MYRTLE LEAF-SPOT. 

 Phyllosticta nuptialis (Thiim.), PL XVII. 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 



