72 PROTESTS AND DISEASE 



The ripe resting cell is enveloped in the remains of the 

 host-cell externally, and internally by its proper capsule 

 consisting of two layers, exospore and endospore. In 

 germination the endospore bulges at one small area very 

 much as happens in the germinating oospore of Cystopus, 

 Fig. 8. The leisured rate of the process as depicted by 

 de Bary is noteworthy. The first three stages shown in 

 Fig. 17 occupied seven days. 



The dark granules seen in Fig. 17, /, are oil-drops, as 

 also are the dark spots in the zoospores. The redistribution 

 of fat plays an important part in the reproductive processes 

 of these parasitic fungi. 



Of the eusynchytrian, 8. succisae, an account has been 

 given by Schroeter, some of whose illustrations are suggested 

 in Fig. 18. 



Schroeter found synchytrians so easy to study that he 

 almost apologises for the lightness of his task. He found it 

 easy to infect young leaves, Fig. 18, A, by placing on them 

 water containing zoospores. The plant-tumour or gall, G, 

 deserves careful scrutiny : the shrunken capsule of a summer 

 or soral sporange lies in the middle ; projecting above it 

 are hypertrophied host-cells ; beneath it and at its sides 

 are infected host-cells containing resting- spores in course 

 of development. In view of what follows we may regard 

 the resting stage as being developed from zygotes, i.e. paired 

 zoospores. 



Recognition of synchytrian infection in wild plants may 



