3i6 DISEASES OF CULTIVATED PLANTS 



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

 or four germ-pores. 



Spermogoniaand aecidia on a different host to teleutospores. 

 Uredospores unknown. 



FIG. 95. Gymnosporangium clavariaeforme. i, teleutospore 

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

 minating and producing secondary spores, a, a; 4, aecidium 

 stage on pear leaf ; 5, aecidium stage on branch, leaves, and fruit 

 of hawthorn ; 6, aecidiospore germinating. Figs, i, 4, and 5 

 reduced, remainder highly mag. 



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 



