PUCCINIA 3ii 



as in other instances, one attack implies immunity in the 

 future. 



Pink rust (Puceinia arenariae, Wint.) often causes injury 

 to cultivated pinks and carnations. It forms small blackish 

 spots arranged in irregular circles on the leaves and stem. 



FIG. 91. Puceinia malvacearum. 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 ft, 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 



