4o6 



DISEASES OF CULTIVATED PLANTS 



SPHAEROPSIDIACEAE 



* Spores continuous 



PHOMA (FRIES.) 



Perithecia subcutaneous then erumpent, globose or com- 

 pressed, not beaked, mouth minute, conidia hyaline, continu- 

 ous, elliptical to subglobose. 



A numerous genus, the species forming crowds of black 

 microscopic dots on stems and leaves. 



Gooseberry shoot spot. Numerous minute black dots 

 nestling in the epidermis of gooseberry shoots, more especially 



FIG. 126. i, Phyllosticta -violae on violet leaf; 2, section of a perithecium 

 of Phyllosticia \ 3, spores of same ; 4, spot on violet leaf formed by the 

 fungus ; 5, Phoma suspecta, on gooseberry twig ; 6, perithecium of same in 

 section ; 7, spores of same. 



near the tip, are exceedingly common ; in fact it is difficult 

 to meet with a shoot of the season clear of these dots, which 

 are the perithecia of Phoma suspecta (Mass.). This fungus is 

 slightly, if at all, parasitic in its nature, and does no real 

 injury, but is somewhat interesting as having been on many 



