MYCOLOGIA 



Vol. I September, 1909 No. 5 



THE HYPOCREALES OF NORTH AMERICA— II 



Fred J. Seaver 

 (With Plate 13, Containing 15 Figures) 



Tribe II. Creonectrieae 



Conidial phase profuse, giving rise to a stroma producing at 

 first conidiophores and conidia, later perithecia ; stroma fleshy, 

 depressed, tubercular or stalked, conidia variable ; perithecia 

 seated on or surrounding the stroma; usually in dense cespitose 

 clusters or occasionally scattered but always entirely superficial; 

 perithecia and spores as in Nectrieae. 



Stroma upright, stalked, surrounded at the base by 

 the cespitose perithecia. 

 Spores i-septate. 12. Sphaerostilbe. 



Spores muriform. 13. Megalonectria. 



Stroma depressed or tubercular, often concealed at 

 maturity by the perithecia. 

 Spores simple. 



Spores hyaline. 14. Allantonectria. 



Spores brown. 15. Sphaerodermatella. 



Spores compound. 

 Spores i-septate. 



Spores hyaline. 16. Creonectria. 



Spores brown. 17. Macbridella. 



Spores more than 1 -septate. 



Perithecia dark blue (black to naked eye). 18. Gibberella. 



Perithecia bright colored, red, yellow, 

 etc. 



Perithecia cespitose on a depressed 



stroma. 19. Scoleconectria. 



[Mycologia for July, 1909 (1 : 131-176), was issued 22 July 1909.] 



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