PUCCINIA 



3" 



as in other instances, one attack implies immunity in the 

 future. 



Pink rust {Puccinia arenariae, Wint.) often causes injury 

 to cultivated pinks and carnations. It forms small blackish 

 spots arranged in irregular circles on the leaves and stem. 





* 



' j ' ': 



* * . ; : . 





Bar 





Fig. 91. Puccinia tnalvacearum. Hollyhock leaf showing 

 pustules of fungus ; 2, teleutospores, one germinating. 

 Highly mag. 



Teleutospores only are present. These are fusoid or 

 clavate, apex thickened, yellow-brown, smooth, 30-50X10- 

 12 fi, pedicel hyaline, about as long as spore. 



This fungus is common on many of our wild caryophylla- 

 ceous plants, as chickweed, stitchwort, lychnis, etc., hence 

 all such weeds should not be allowed to grow in the neigh- 

 bourhood of cultivated plants. The directions given under 



