PLATE 40. 



Dothideaceae. 



Fig. 1. Dothidea Montaniensis, E. & E. several stromata somewln 

 enlarged, on bark of Bigelovia ? 



2. Vertical section of a stroma. 



3. An ascus. 



4. A sporidium. 



5. Phyllachora graminis, (Pers.) somewhat enlarged, on le* 

 of grass. 



6. Vertical section of the same. 



7. An ascus. 



8. A sporidium. 



9. Homostegia Kelseyi, E. & E. somewhat enlarged on dead 

 stem of Ribes rotundifolium. 



10. Vertical section through a stroma. 



11. 'An ascus. 



12. Two sporidia. 



13. Rhopograplms filicinns, (Fr.), somewhat enlarged, on 

 Pteris aquilina. 



14. Vertical section of the same. 



15. An ascus. 



16. Two sporidia. 



