SPHAEROPSIDIACEAE 



Nectrioideae 



393 



A small family of minute forms, mostly saprophytic on 

 dead wood, bark, etc. The species are of a soft, somewhat 



FlG. 127. Gloeosporium frucligenum, a parasite on 

 apples and other fruit, i, appearance of the disease on 

 an apple : the diseased patches become depressed owing 

 to the destruction and collapse of the cells, and soon 

 become studded with the pustules of fruit arranged more 

 or less in concentric circles ; 2, apex of one of the fruit 

 pustules emitting a mucilaginous tendril of minute conidia 

 through a crack in the epidermis of the apple ; 3, section 

 through one of the fruit pustules, showing the slender 

 conidiophores bearing conidia at their tips ; 4, three 

 conidiophores, each bearing a conidium. Fig. i, reduced ; 

 the others mag. 



fleshy consistency, and usually brightly or clearly coloured, 

 superficially in these respects resembling the ascigerous 

 family Nectrieae. Zytkia, the largest genus, is suspected 

 as representing a conidial form of the genus Nectria. 



