IOWA DISCOMYCETES X13 



On bark of TJlmus, Iowa City and ]\It. Pleasant, rather common. 

 The species has also been observed and studied in North Da- 

 kota and probably has a wide distribution. 



Hysteropatella elliptica (Fries) Rehm, Rabenh, Krypt. FI. 

 P: 368. 1896. 



Hysterium ellipticum Fries, Obs. ]Myc. 1 : 195. 1815. 



Plants gregarious or often crowded in little clusters bursting 

 through the epidermis, similar in general appearance to the pre- 

 ceding but a little larger ; asci elavate, 8-spored ; spores elliptical, 

 at first hyaline, becoming pale brown, 3-septate, 23 by 8/x. 



On bark (Pyrus) Mt. Pleasant. 



The plants are quite similar in external appearance to the 

 preceding but show a marked difference in the size of the spores. 

 The plants from which the description has been drawn have been 

 examined by Dr. Rehm and referred to this species. 



Hysteropatella clavispora (Peck) comb. nov. 

 Plate 36, f . n. 



TryMidium clavisporum Peck, Ann Rep. N. Y. St. Mus. 35: 



143. 1883. 

 Patellaria clavispora Sacc, Syll. Fung. 8 : 787. 1889. 

 Leciographa clavispora Morgan, Jour. Myc. 8 : 180. 1902. 



Plants gregarious, at first immersed becoming erumpent, hys- 

 teriform with the lips gradually spreading becoming boat-shaped 

 and under favorable conditions of moisture the plants become 

 entirely rounded and patelliform, black; asci broad-clavate, con- 

 tinued below into a stem-like base, 75 by 15 to IS/j.. 8-spored; 

 spores 2-seriate or irregularly crowded, at first hyaline, becoming 

 yellowish finally pale brown, 3 to 5-septate (rarely 5), elavate 

 with the narrow end below, with an oil-drop in each cell, 25 to 30 

 by 8 to 9^; paraphyses forming a black epithecium. 



On bark of willow also on decorticated wood of willow (Salix) 

 and Cottonwood (Populus), Iowa City and Mt. Pleasant, com- 

 mon. 



The plants of this species have been collected and studied by 

 the writer for several years and so far have been found only on 



