198 THE FUNGI WHICH CAUSE PLANT DISEASE 



Asci many-spored 

 Perithecium fleshy, ostiole ele- 

 vated 8. Metanectria. 



Perithecium hard, ostiole sunken 9. Cyanocephalium. 

 Spores 2 to many-celled 

 Spores not appendiculate 

 Perithecium bright colored, not 



blue 10. Calonectria, p. 205. 



Perithecium blue or violet 11. Gibberella, p. 206. 



Spores appendiculate, 4-celled 

 Perithecia clavate, ostiole wart- 

 like 12. Paranectria. 



Perithecia flask-shaped, ostiole 



elongate 13. Lecythium. 



Spores muriform 



Perithecium bright colored, not 



blue 14. Pleonectria, p. 207. 



Perithecia dark colored or blue. . . 15. Pleogibberella. 

 Spores filiform 



Perithecia fleshy, bright colored 16. Ophionectria, p. 207. 



Perithecia horny, brown 17. Barya. 



Conidiophores of the Stilbum type, stroma 

 wanting 



Spores 2-celled 18. Sphserostilbe, p. 207. 



Spores 4-celled 19. Stilbonectria. 



Spores muriform 20. Megalonectria. 



Tbibb V. Hypocreeffi (p. 197) 



Stroma sunken in the substratum or grown 

 to it, usually free later 



Spores 1-celled 21. Polystigma, p. 207. 



Spores 2-celled 22. Valsonectria, p. 208. 



Spores several-celled by cross walls 23. Cesatiella. 



Spores muriform 



Spores hyaline 24. Thyronectria. 



Spores olive-brown 25. Mattiiolia. 



Stroma from the first separable from the 

 substratum 



Spores 1-celled 26. Sellnia. 



Spores 2-celled 



Cells of the spores separating in the ascus 



