Parasitism in ttie Eiysiphaceae. 311 



(continued). 



R e m a r k s. 



42 b. Sept. 7. The 2 inoculated leaves with. patches of myceliuin bearing 

 young conidiophores. Sept. 17. Infected leaves with powdery masses 

 of spores. 



46 c. Sept. 6. AU 3 leaves with very numerous and vigorous patches of 

 mycelium with yoimg conidiophores. Sept. 9. The infected leaves 

 with abundant powdery patches of spores. 



46 b, Sept. 5. Slight signs of infection. Sept. 6. AU the inoculated leaves 



with smaU flecks of myceUum. Sept 9. All the infected leaves with 



powdery masses of spores. 

 46 d, 4(3 e. Sept. 6. Minute flecks of myceUum on some of the inociüated 



leaves. Sept. 9. A few small patches of myceUum with conidiophores 



on the 3 infected leaves. 



46 f. Sept. 6. Minute flecks of mycelium on the inoculated leaves. Sept. 9. 

 A few small flecks of myceUum with a few conidiophores on the in- 

 fected leaves. Sept. 15. A powdery mass of spores on 1 of the in- 

 fected leaves. 



5ir. Sept. 8. A few flecks of myceUum on 1 leaf. Sept. 12. Both leaves 

 with numerous patches of naycelium and spores. Sept. 17. The 2 

 leaves with densely powdery patches of spores: controls free. 



54 d, 54 e, 54 f, 54 g. Sept. 8. The 4 inoculated leaves with flecks of mycel- 

 ium. Sept. 12. All the infected leaves richly covered with powdery 

 masses of spores; controls free. 



spores from Avena nuda. 



R e m a r k s. 



33 a, 33b. Aug. 30. Several of the inoculated leaves with flecks of mycel- 

 ium. Sept 2. All the G inoculated leaves with well-grown patches 

 of mycelium bearing more or less powdery masses of spores. 



33 c, 33 d, 38 g. Aug. 31. Minute flecks of myceUum on some of the inoc- 

 ulated leaves. Sept. 2. All the 7 inoculated leaves with well-grown 

 patches of mycelium bearing conidiophores. Sept. 4, AU the infected 

 leaves with powdery masses of spores. 



33 e, 33 f. Aug. 31. Flecks of myceUum on most of the inoculated leaves. 

 Sept. 2. The 6 leaves all bearing vigorous patches of mycelium with 

 conidiophores, and here and there powdery masses of spores. 



21-' 



