PESTS OF THE ORNAMENTAL SHRUBBERY. 



15 



large masses, of a pale orange colour, and powdery. No aecidiospores or 

 teleutospores are known to be associated with it. The uredospores are 

 produced in chains, somewhat as in JEcidium, and are globose or ovate 

 (17-28 x 12-21 /t), very variable in size, and delicately punctate. 



It has been recorded in Belgium, Germany, Switzerland, Italy, and 

 Kussia. 



Sacc. Syll. vii. 3140 ; Cooke, M. F. p. 216 ; Cooke, Hdbk. No. 1576a. 



About fourteen different kinds of leaf-spots have been described on 

 species of Euonymus, but they have not been observed in Britain, 

 excepting Phyllosticta euonymi on Euonymus europaus. 



Sacc. Syll. i. 68 ; Grevillea, xiii. 71. 



Spindle-tree Mildew. 

 Microsphcera euonymi (DC), PI. XVI. fig. 28. 



This common mildew«is not unusual in autumn on uncultivated plants 

 oi\Euonymus europceus, although, like others, it has had to suffer a change 

 of name from Microsphcera comata, by which it hasjong been known. 



The delicate thin mycelium attacks the upper surface^ of the leaves, 

 and imparts a chalky appearance, at first sprinkled with the conidia. 

 Later on the little globose receptacles are scattered over the mycelium, as 

 in other species. Each of these encloses eight pear-shaped asci, which 

 contain four sporidia. The appendages which surround the receptacles 

 are six times as long as the diameter of the receptacles. 



It is reported for Britain, France, Belgium, Germany, and Italy. 



Sacc. Syll. i. 38 ; Cooke, M. F. p. 226 ; Cooke, Hdbk. No. 1923. 



Cornel Leaf- spot. 

 Phyllosticta comicola (DC), PI. XVI. fig. 29. 



This form of leaf-spot is by no means uncommon on leaves of Cornus 

 sanguinea and other species. The spots are rather large, and dark blood- 

 red, turning pale in the centre. The receptacles are rather larger than 

 usual, and the sporules oblong, narrowed towards each end (7-9x3-4yu), 

 enclosing two guttules. 



It has been recorded in France, Italy, Siberia, and North America. 



Sacc. Syll. iii. 103 ; Grevillea, xiii. 72. 



Another species (Phyllosticta comi) is known on the leaves of Cornus 

 alba in Belgium with very dark brown spots, becoming white in the 

 centre, and only from three to six receptacles scattered over each spot. 

 Sporules elliptical (10 x 5 /i). 



Cornel Grey Leaf-spot. 

 Septoria comicola (Desm.), PI. XVI. fig. 30. 



The leaves of Cornus sanguinea are often spotted by this parasite, 

 which produces roundish grey spots on the leaves, with a dark purple 



