532 Seaver : Some North Dakota Hypocreales 



The species is well marked by the delicate rose color of the sub- 

 iculum and perithecia as well as by spore characters. 



V. Hypocrea 



Hypocrea citrina (Pers.) Fries. On dead limbs of basswood, 

 especially where the outer bark has been removed. Plants form 

 a bright lemon-yellow stroma, often several inches in extent on 

 the substratum. The perithecia are seen as little dots over the 

 surface of the stroma. The plants resemble those of the preceding 

 genus but are readily distinguished by the spore characters. Con- 

 siderable quantity of this material has been collected but always 

 on the same host. 



Hypocrea patella Peck. The stroma in this species is very 

 small as compared with the preceding and not so bright-colored. 

 In the specimens of this species collected, it seems to show a ten- 

 dency to grow on old sphaeriaceous fungi. This has been com- 

 pared with specimens identified by Professor Peck. 



Hypocrea Richardsoni Berk. & Mont. Very common on 

 limbs of Popnlus tretmiloides in woods near Fargo. No perithecia 

 have been seen in any of the specimens which have been examined. 

 Although in external appearance the plants resemble a Hypocrea, 

 it is doubtful if they rightfully belong to this genus. 



Hypocrea rufa (Pers.) Fries. The specimens which were 

 collected in Fargo were small and not fair examples of this species, 

 but they seem to belong here. 



VI. Cordyceps 



CORDYCEPS MILITARIS (L.) Link. 

 Isaria farinosa Fries . 



On larvae of insects in Fargo woods. Only the conidial phase 

 of this plant was collected in North Dakota but that occurred in 

 considerable abundance and doubtless the mature fruit would have 

 appeared at the proper season. The conidial phase is character- 

 ized by the snow-white feather-like growth, with its yellowish stem 

 which springs from larvae that are buried under leaves and soil. 



Cordyceps pistillariaeformis Berk. & Broome. On scale- 

 insects on branches of Xanthoxylum americanuin in woods about 

 Fargo. The plants of this species collected do not show mature 



