FUNGOID PESTS OF CULTIVATED PLANTS. 185 



CoTONEASTER SPOT. 



Phyllosticta sanguined (Desm.), PL XVII. fig. 17. 



This species, which is usually found on the dead leaves of the Bird 

 Cherry, has occurred in this country on the living leaves of Cotoneaster 

 frigida. The spots are roundish and brown, girt by a darker line, out- 

 side which the tissue is stained of a blood red. The receptacles are 

 scattered over the spots, and are black, point-like, and shining. The 

 sporules are ovate, with two nuclei (8 /x long), and uncoloured. 



Known in France and Britain. 



Sacc. Syll. iii. 14 ; Grevillea, xiii. 71. 



Butcher's Broom Spot. 

 Phyllosticta ruscicola (Dur. & Mont, f.), PI. XVII. fig. 18. 



This pest occurs on the phyllodes of the Butcher's Broom, Ruscus 

 aculeatus, and other species. The spots are roundish or indistinct, 

 whitish, with a brown border, and the perithecia, which are seated upon 

 these spots, are at first covered. The sporules are oblong and colourless 

 (7-8 XH yLt). 



Probably this is an imperfect condition of an ascomycete, which is 

 developed on the dead phyllodes. 



It is not only common in Britain, but is known also in France, 

 Belgium, Portugal, Austria, and Italy. 



Sacc. Syll. iii. 319 ; Cooke, Hdbk. No. 1346. 



As the phyllodes are persistent, this may be regarded for our purposes 

 as an evergreen shrub. 



Mahonia Leaf-spot. 

 Phyllosticta Mahonia (Sacc. k Speg. f.), PI. XVII. fig. 19. 



Mahonia leaves are rather given to discoloration and sometimes to 

 spotting, but in this instance no definite spots are formed, and the 

 receptacles are scattered over the surface. In British specimens the leaves 

 were still living and adhering to the plant, but the receptacles were rather 

 larger than usual, containing broadly elliptical sporules (4-6 x3-4/i). 



It has been found also in France and Italy. 



Sacc. Syll. iii. 131 ; Grevillea, xiii. 72. 



Another spot is known to occur on the leaves of Mahonia japonica, 

 in which large bleached spots occur with a brownish margin. The 

 sporules are scarcely different in size (4-4^ x2^-8 /<), but the spotting 

 is quite distinct. It has been found at present only in Portugal. 



The ordinary leaf-spots (Phyllosticta lierbcridis and Septoria Uei- 

 beridis) on leaves of the common Berberry have not yet been observed in 

 Britain. 



Grevillea, xiii. 72. 



JEcidium Berbcridis sometimes occurs on the leaves and berries of 

 Mahonia. See Smith, Field Crojis, fig. 87. 



