182 FUNGOID PESTS OF CULTIVATED PLANTS. 



Box Leaf White Spot. 

 Phyllosticta limbalis (Pers.), PL XVI. fig. 8. 



The only leaf- spot on the common Box is itself not so very common, 

 although conspicuous. There may be some half-dozen other kinds of 

 leaf-spot, at one time or other described, on so widespread a plant, but 

 they are not British, and the present one is rather a curiosity than a pest. 



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 fi 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 /j) 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, Ildbk. No. 1350. 



Box Leaf-hust. 

 Pucdnia 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 /<), 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. 2:!72 ; Cooke, M. /•>. p. 201 ; Cooke, lldbk. No. 1514; 

 Sow. I'iiu. t. 189. 



hv Leaf-spot. 

 Phyllosticta hedericola (Dm-. A- Mont, f.j, I'l. \\'l. fig. 10. 



This spot has been Known for many years on [vy Leaves and occurs 

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

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

 i nclose the oblong hyaline sporules (6 x 2£ p). 



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

 Britain, France, Italy, and Austria. 



Sacc. Syll. iii. 10d ; (Ircrillca, xiii. 71. 



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

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



