Seaver: Discomycetes of North Dakota 113 



Patellaria clavispora (Peck.) Sacc. This species is very 

 common on bark and wood of willow and cottonwood. The 

 spores are very different in form and color from the preceding. 

 Collected about Fargo. 



26. Blitrydium 



Blitrydium fenestratum (Cooke & Peck) Sacc. Plants 

 similar to those of the two preceding genera but spores much 

 larger, broader, brown, and divided by both longitudinal and 

 transverse septa, becoming muriform. Collected commonly on 

 the bark of dead twigs of Populus tremuloides, in woods near 

 Fargo. 



27 Cenangium 



Cenangium furfuraceum (Roth.) DeNot. Plants forming 

 cespitose clusters bursting through the bark of the host. Col- 

 lected commonly about Fargo on dead branches of Corylus sp. 

 The cups remain for a long time closed, finally opening and 

 becoming cup-shaped. 



28. Dermatea 



Dermatea sp. A species of this genus was collected in great 

 abundance on dead branches of Amelanchier sp. in woods at 

 Hawk's Nest. The species is still undetermined. 



3. PHACIDIINEAE 



29. Propolis 



Propolis faginea (Schrad.) Karst. Forming white lines 

 often 1 mm. wide and several mm. long on old wood. The white 

 surface constitutes the hymenium of the plant, which consists 

 of asci, paraphyses and spores. Collected commonly in woods 

 near Fargo. 



4. HYSTERIINEAE 



30. Hysteropatella 



Hysteropatella prostii (Duby.) Rehm. Plants boat-shaped, 

 and intermediate in form between Patellaria and Hysterium, 

 the plants being at first hysteriform and later becoming sub- 

 patellate. Collected near Fargo. 



