Photo by] 



\E. Step. 



FIG. 697. Gymnosporangium clavaricBforme. 

 The spore of Roestelia germinating on Juniper produces this distortion of the stem, from which proceed the jelly- 

 like, tongue-shaped fructifications, bearing spores which germinate on hawthorn and produce the mass of Cluster- 

 cups shown in fig. 696. 



551 



