Parasitism in the Erysiphaceae. 299 



spores from B. hordeaceus. 



E. .e m a r k s. 



2 a, 2 b. Aug. (j. Patclies of mycelium on some of the inoculated leaves. 

 Aug. 7. The 12 leaves all clearly infected and bearing patches of 

 mycelium with young conidiophores. Aug. 11. All the inoculated 

 leaves fully infected and bearing povi^dery masses of spores; controLs 

 aU free. 



18 e. Aug. 20. Very minute flecks of mycelium on the 4 inoculated leaves. 

 Aug. 23. The infected leaves with powdery masses of spores. 



23g. Aug. 25. 3 of the inoculated leaves with minute flecks of mycelium. 

 Aug. 29. All 4 leaves vdth powdery masses of spores; controls free. 



26 a. Aug. 2G. A few very minute flecks on some of the inoculated leaves. 

 Sept. 3. All the inoculated leaves with powdery masses of spores. 



32 c, 32 d, 32 i. Aug. 28. Flecks of mycelium on some of the inoculated 

 leaves. Aug. 29. 9 of the inoculated leaves with patches of mycelium 

 bearing young conidiophores; all controls free. Sept. 1. The infected 

 leaves with powdery masses of spores, controls still free. 



57 a. Sept. 10. Faint signs of infection on 1 inoculated leaf. ?ept. 12. 

 1 inoculated leaf with numerous mycelial patches and groups of young 

 conidiophores; the other inoculated leaf turning yellow and dying; 

 controls free. 



18 a, 18 b. Aug. 20. Most of the inoculated leaves vdth flecks of mycel- 

 ium bearing a few conidiophores. Aug. 23. All the infected leaves 

 with powdery masses of spores. 



22 a, 22 b. Aug. 23. Signs of infection on some of the inoculated leaves. 



Aug. 24. (j leaves with flecks uf mycelium and young conidiophores. 

 Aug. 27. The 7 infected leaves all with powdery masses of spores; 

 controls al free. 



45 a. Sept 6. All 5 leaves with vigorous patches of mycelium and dense- 

 ly clustered conidiophores. Sept. 9. All the leaves with powdery 

 masses of spores. 



47 a. Sept. 5. The 6 leaves all with vigorous patches of mycelium and 

 young conidiophores. Sept. 7. All the leaves vpith dense powdery 

 masses of spores. 



65 a. Sept. 13. Faint flecks of mycelium on some of the inoculated leaves. 

 Sept. 15. Well - grown flecks of mycelium with young conidiophores 

 on all the infected leaves. Sept. 17. All the infected leaves with pow- 

 dery masses of spores; controls still free. 



18 f, 18 g. ,Subinfection' only. Aug. 20. 3 of the inoculated leaves with 

 patches of mycelium; controls free. Aug. 21. 5 leaves with flecks of 

 mycelium with a few scattered conidiophores. Aug. 27. A few mycel- 

 ial patches with a very few scattered conidiophores on 7 of the inoc- 

 ulated leaves. 



32 g. ,Subinfection' only Aug. 30. A minute fleck of mycelium on 1 of 

 the inoculated leaves. Sept. 1. Minute flecks of mycelium and a few 

 conidiophores on 2 of the inoculated leaves at the exact place where 

 spores were sown. 



23 a, 23 b. ,Subinfection' only. Aug. 25. A very few scattered conidio- 



phores on 3 of the inoculated leaves Aug. 29. A few scattered conidio- 

 phores on 8 leaves; conidiophores very scattered and only just visible 

 under a simple lens; occurring only at the exact Spots where spores 

 were sown; all controls free. Aug. 31. Fungus dying away. Sept. 4. 

 Fungus disappeared. 

 401 40 m. Subinfection' only. Sept. 5. 8 of the leaves with scattered conidio- 

 ' phores occurring as described above. Sept. 7. Fungus dying away. 



