IOWA DISCOMYCETES 107 



ing been collected by the writer in New York, North Dakota as 

 well as in Iowa. The plants grow in such numbers as to almost 

 completely cover the stems and leaves of the host. 



Mollisia cinerea. (Batsch) Karst, Myc. Fenn. 1: 189. 1871. 



Peziza cinerea Batsch, Elench. Fung. 2 : 198. 1786. 

 Niptera cinerea Fuckel, Symb. Myc. 292. 1869. 



Plants gregarious or scattered, at first globose becoming ex- 

 panded, cinereous or sublivid, margin often elevated, whitish, 

 undulated or wavy, .5 to 2 mm. in diameter; asci cylindrical to 

 clavate, 45 to 70 by 5 to 6/x; paraphyses filiform scarcely en- 

 larged at their apices. 



On decaying wood of various kinds, common. 



*Mollisia polygoni (Lasch.) Gill., Discom. 120. 1879. 



Plate 35, f. n. 



Peziza polygoni Lasch., Rabenh. Herb. Myc. 1127. 



Niptera polygoni Rehm, Ber. Naturh. Ver. Augsburg 26 : 21. 



1881. 

 Peziza luctuosa Cooke, Hedwigia 14 : 83. 1875. 



Mollisia atrata (Pers.) Karst., Myc. Fenn. 1: 200. 1871. 

 Peziza atrata Pers. Syn. Fung. 669. 1801. 

 Pyrenopeziza atrata Fuckel, Symb. Myc. 294. 1869. 



Plants gregarious, at first globose, becoming expanded, .5 to 

 1 mm. in diameter, externally blackish, hymenium concave, yel- 

 lowish to cinereous or quite black ; asci cylindrical to clavate, 25 

 by 5 to 6/x; spores elongated elliptical 5 to 6 by 2/x; paraphyses 

 very slender. 



On dead stems of Ambrosia trifida. 



As stated in previous reports the plants referred to this name 

 here are larger than is usually indicated for this species but in 

 other respects seem to conform well. 



There seems to be some difference of opinion as to what the 

 real Peziza atrata Persoon was, the species having been originally 

 reported on wood, which at the present time is known only on 

 herbaceous stems. While the same species do often occur on 



