PLATE II 
Fig 
1. Sphaeotheca humuli, Burr., perithecium ; mag. . ^ 
2. Phyllctinia corylea, Karst., perithecium ; mag. 
3. Ascrs of same, contairing three spores ; mag. , 
4. Uno'nula salicis, Winter, perithecium ; mag. 
5. Ascas of same, containing eight spores ; mag, ' 
6. Oitium or conidial stage of same ; mag. 
7. Pdosphaera oxyacanthae, De Bary, vai. tridactyla, Salmon; 
mag. , 
8. '^hielavia hasicola, Zopf, conidial form ; mag. 
9. Resting-spore form of same ; mag. 
10. Ascus containing eight spores of same , mag. 
11. Sphaerotheca mots-avae, Schw., oidium or conidial stage ; mag. 
12. Ascus of same, contaLiing eight spores ; mag. 
13 Hemileia americana, Mass., uredo stage ; mag. 
