PLATE 20. 



Melanommeae. 



Fig. 1. Rosellinia Clavariae, (Tul.) natural size on living Clavaria. 



2. Branch of same somewhat magnified. 



3. Section of a perithecium highly magnified. 



4. A cluster of asci. 



5. Three sporidia. 



6. Conidiophores with conidia. 



7. Three conidia highly magnified. 



8. Rosellinia ovalis, Ell. on piece of "sage brush," natural 



size. 



9. Piece of the same enlarged. 



" 10. Sectional view of a perithecium. 

 " 11. Two asci. 

 " 12. Three sporidia. 

 NOTE.- -Figures not drawn to a definite scale. 



