IOWA DISCOMYCETES 95 



and globose, becoming expanded and cup-shaped or plane; asci 

 cylindrical to clavate, 8-spored; spores elongated or elliptical, 

 straight or curved, simple, hyaline, 1-seriate. 



The genus is distinguished by the sclerotium from which the 

 plants grow. Three species found in Iowa, two of which have 

 their type locality in this state. 



KEY TO THE SPECIES. 



Sclerotium formed in acorns S. pseudotuberosa. 



Sclerotium formed in seeds of bass wood. . . . S. tilice. 



Sclerotinum formed in seeds of wild cherry. . . S. seaveri. 



Sclerotixa pseudotuberosa Rehm. Rabenh. Krypt. Fl. I 3 : 

 809. 1896. 



Ciboria pseudotuberosa Rehm, Ber. Naturh. Ver. Augsburg 26: 

 28. 1881. 



Stromatinia pseudotuberosa Boud., Bull. Soc. Myc. France, 1: 



115. 1885. 

 Hymenoscypha pseudotuberosa Phill., Brit. Discom. 119. 1887. 



Plants gregarious, stipitate; stem often 2 cm. long, subflex- 

 uose, when dry longitudinally striated, olivaceous to olivaceous- 

 brown ; cups at first closed and globose, becoming expanded when 

 moist, 5 to 7 mm. in diameter ; hymenium brownish ; asci clavate, 

 8-spored, 120 by 6/x; spores elliptical to ovate, smooth, simple; 

 paraphyses filiform, 3^. in diameter at their apices, hyaline. 



On acorns, Decorah. 



The only specimens of this species seen were those collected 

 by Mr. E. W. D. Hoi way in the northeast part of the state. 



Sclerotina (Stromatinia) tille Reade, Ann. Myc. 6: 114. 

 1908. 



Apothecia mostly solitary, cyathoid, long stipitate, 0.5-1 cm. 

 high, Isabelline color (R), stipe smooth, slender, cylindrical, 0.5 

 mm. or less thick; disc at first closed then expanded, saucer- 

 shaped. 1 to 3 mm. across, excipulum with pseudoparenchymatous 

 outer layer and a prosenchymatous medulla; asci cylindrical- 

 clavate, 140 to 170 by 8 to 10/x, apex round-truncate, spores blue 

 with iodine, continuous. 9 to 11 by 4 to 5/x; paraphyses scatter- 

 ing, filiform, hyaline. 



