PESTS OF THE ORNAMENTAL ft H RUBBER V. 



7 



The spots are of ivory whiteness, and marginal, so as to appear like 

 a broken ring, or fragments of a ring around the edge of the leaves. The 

 receptacles, when present, are minute and scattered, sometimes con- 

 spicuously absent, but when fertile they enclose subglobose colourless 

 sporules, enclosing each a minute guttule (3-4 p diam.). 



This species has been found in Britain, France, Belgium, Germany, 

 and Italy. 



Fungicides will scarcely be required, as it is rarely to be met with. 



Just such a similar leaf-spot, which is not to be distinguished from 

 it by the naked eye, has been found in Portugal and Italy, the sporules 

 of which (15 x 2 are long and narrow, and divided across the centre 

 into two cells — but this is called Ascochyta limbalis. 



Sacc. Syll. iii. 124 ; Grevillea, xiii. 72 ; Cooke, Hdbk. No. 1350. 



Box Leaf-rust. 

 Puccinia buxi (DC), PI. XVI. fig. 9. 



Occasionally the leaves of Box shrubs are seen plentifully sprinkled 

 with the brand or rust, but unaccompanied by either cluster-cup or uredo. 

 The pustules are usually very formally discoid and cushion -like, compact 

 and not powdery, of a very dark brown colour, and on both surfaces of 

 the leaves. The teleutospores are oblong-clavate, rather thickened and 

 obtuse at the apex, the lower cell almost wedge-shaped, and longer than 

 the upper, constricted at the division (55-90 x 20-35 /j), even, and of a 

 bright cinnamon colour. At first with a long uncoloured pedicel. 



Known in Britain, France, Belgium, Switzerland, Germany, Italy, and 

 Portugal. 



Pick off and burn infected leaves, whenever observed. 

 Sacc. Syll. vii. 2372 ; Cooke, M. Ft. p. 201 ; Cooke, Hdbk. No. 1514 ; 

 Soiv. Fun. t. 439. 



Ivy Leaf-spot. 

 Phyllosticta hedericola (Dur. & Mont, f.), PI. XVI. fig. 10. 



This spot has been known for many years on Ivy leaves and occur- 

 on the upper surface, causing round bleached spots with a rather broad 

 brownish margin. The small receptacles are dotted over these spots, and 

 enclose the oblong hyaline sporules (6 x 2J /*). 



Although first recognised in Algeria, it has since been recorded in 

 Britain, France, Italy, and Austria. 



Sacc. Syll. iii. 100 ; Grevillea, xiii. 71. 



Two other species of the same genus of leaf-parasites have occurred 

 on Ivy leaves in Europe: Phyllosticta hederce on large brown spots, with 

 smaller sporules (4x1 fi), in Franco 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 /<), only 

 at present recognised in Italy. 



