OBDER CHTTEIDIALES 



51 



Fig. 11. Chytridiales, Family Synchytriaceae. Synchytrium endobioticuni (Schilb.) 

 Perc. (A) Zoospores. (B-D) Stages in the infection of the host. (E) Parasite in the 

 upper part of host cell. (F) Parasite enlarged. (G, H) Sorus pushing out from pro- 

 sorus. (I) Beginning of nuclear multiplication in sorus. (J) Beginning of segmentation 

 in sorus. (K) Sorus containing five zoosporangia. (L) Single zoosporangium containing 

 swarm cells. (M-0) Stages in union of swarm cells. (P-R) Infection of host by zygote. 

 (S) Resting sporangium in host cell. (T) Resting sporangium producing swarm cells. 

 (After Curtis: Trans. Roy. Soc. London, B, 210:409-478.) 



