IOWA DISCOMYCETES H5 



12-septate and muriform with an oil-drop in each cell, 45 to 50 

 by 15 to 18/*; paraphyses forming an epithecium. 



On dead branches of Populus tremuloides, Decorah. 



The only Iowa material of this species seen was that collected 

 by Mr. Holway but the species has been found by the writer to 

 be very common in North Dakota on dead branches of the above 

 host in aspen timber near Fargo. 



FAMILY 10. CENANGIACE^E. 



Plants at first immersed, becoming erumpent for the most part 

 dark colored, at first closed later opening and concave to plane ; 

 asci mostly 8-spored; spores elongated to filiform, 1 to many- 

 celled, often muriform, hyaline to brown ; paraphyses branched 

 forming an epithecmm. 



CENANGIUM Fries, Syst. Myc. 2 : 177. 1822. 



Cups scattered or tufted at first immersed, then breaking 

 through the substratum, sessile, leathery or waxy, brown or 

 blackish; receptacle cup-shaped or nearly plane; asci clavate, 8- 

 spored, elongate, cylindrical or tapering at the ends ; spores sim- 

 ple, hyaline ; paraphyses enlarged at their apices, forming an 

 epithecium. 



Two species collected in the state. 



KEY TO THE SPECIES. 



Plants sessile, deep, enp-shaped C. populneum. 



Plants short stipitate, hymenium nearly plane. . . C. rubiginosum. 



*Cenangium populneum (Pers.) Kehm, Rabenh. Krypt. FL 

 13: 220. 1896. 



Plate 39, f. I. 



Peziza populnea Pers., Tent. Disp. Meth. Fung. 35. 1797. 



Peziza fascicularis A. & S., Conspect. Fung., 315. 1805. 



Dermatea fascicularis Fries, Summa. Veg. Scand., 362. 1849. 



Encoelia fascicularis Karst., Myc. Fenn. 1 : 217. 1871. 



Cenangium fascicularie Karst., Act. Soc. Fauna Fl. Fenn. 2 r 

 145. 1885. 



