PLATE 27. 



Spbaerelloideae. 



Fig. 1. Physalospora aurantia, E. & E. on dead leaves of Astraga- 

 lus, natural size, 



" 2. Part of a leaf somewhat enlarged. 



" 3. Enlarged section of a perithecium. 



" 4. An ascus with uniseriate sporidia. 



" 5. An ascus with partly biseriate sporidia. 



•' 6. A sporidium. 



" 7. Sphaerella Oenotherae, E. & E. natural size, on old capsule 

 of Oenothera biennis, 



" 8. A small piece enlarged. 



9. Enlarged section of a perithecium. 



" 10. An ascus. 



" 11. A sporidium. 



" 12. Stigraatea Robertiana, Fr. natural size, on leaf of Geran- 

 ium. Robertianum. 



" 13. Piece of same enlarged. 



" 14. Sectional view of perithecium. 



" 15. An ascus. 



" 16. A sporidium. 



" 17. Sphaerulina myriadea, (Pers.) natural size on dead oak 

 leaf 



18. Portion of same enlarged. 



19. Sectional view of a perithecium more highly magnified. 

 " 20. An ascus. 



" 21. A sporidium. 



