3i6 



DISEASES OF CULTIVATED PLANTS 



country); i-septate, rarely 2-septate, each cell having two 

 or four germ-pores. 



Spermogonia and aecidia on a different host to teleutospores. 

 Uredospores unknown. 



FlG. 95. Gymnosporangium cl 1, t<]<utospore 



;c on juniper branch; 2, teleutospores; 3, teleutospores ger- 

 minating and producing secondary spores, ti. <' ; 4, aecidium 

 ir leaf ; 5, aecidium stage on branch rid fruit 



of hawthorn ; <>. ^pore germinating. Figs, 1,4, and 5 



ii-duced, remainder highly ma 



Hawthorn cluster-cups ( Gymnosporangium clavariaeforme, 



Jacq.) causes spindle-shaped swellings on the branches of 

 funiperus communis, and during the months of April and 

 May numerous flattened, pale-orange, gelatinous masses 



