THE HYPOCREALES OF NORTH AMERICA- 

 HI. 



Fred J. Seaver 



(With Plates 20 and 21, Containing 37 Figures) 



Family 11. HYPOCREACEAE 



Stromata conspicuous, seated directly on the substratum or 

 springing from a sclerotium in the bodies of insects, fungi, or the 

 ovaries and stems of plants, effused without definite margin, 

 patellate, substipitate or erect; perithecia partially to entirely im- 

 mersed in the stroma, rarely subsuperficial (especially in aged 

 specimens) ; asci cylindrical or clavate, 8-i6-sporcd; spores sub- 

 globose to filiform, simple or compound, hyaline or colored. 



Stroma seated directly on the substratum, usually patellate or 



effused, rarely clavate and erect ; spores rarely filiform. Hypocreae. 



Stroma springing from a sclerotium, usually erect and clavate, 



rarely depressed; spores filiform. Cordycepteae. 



Stromata patellate or effused, rarely clavate and erect, not 

 springing from a sclerotium; perithecia partially to entirely im- 

 mersed, papillate, with the neck often protruding; asci cylindrical 

 or clavate, 8-i6-spored ; spores subglobose, elliptical, fusiform or 

 filiform, simple or compound, hyaline or simple. 



Asci i6-spored (by the separation of each original spore 

 into two subglobose cells). 

 Stroma patellate or effused. 



Spores hyaline. 23. Hypocrea. 



Tribe III. Hypocreae 



Spores becoming greenish or brownish. 

 Stroma clavate and vertical. 



24. Chromocrea. 



25. Podostroma. 



Asci 8-spored ; spores elliptical, fusiform or filiform, 

 Stroma with stilbum-like outgrowths. 

 Stroma without stilbum-like outgrowths. 



26. Stilbocrea. 



Spores elliptical to fusiform. 



27. Chromocreopsis. 



