5i8 



SPECIAL PLANT PATHOLOGY 



Fig. 187. — Hollyhock rust, Puccinia malvacearum. i, Typic mature telio- 

 spore; 2-6, different stages in growth of promycelium (basidium); 7, forked promy- 

 celium; 8, basidium dividing into 4 cells; 9, basidium resembling a germ tube; 10—12, 

 cells breaking apart; 13-16, germination of promycelial cells; 17, empty cell; 18, 

 mature basidiospores ; 19, 20, same in germination; 25, 26, formation of chlamydo- 

 spore-like bodies in old promycelia. {After Taubenhaus, J. J.. Phyiopath. I, April, 

 1911.) 



