PLATE 20. 



Melanommeae. 



Fig. 1. RoselliiiiaClavariae,(Tul.) natural size on liviugClaTaria. 



" 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. 



