THE DISCOMYCETES OF EASTERN IOWA. 273 



Family III— ASCOBOI,ACE^. 



Receptacle generally sessile on the surface, at first closed, 

 later more or less expanded, nearly always found on dung. 

 Peridium thin or wanting. Hypothecium for the most part 

 well developed, consisting of roundish cells. Asci at maturity 

 protruding beyond the surface of the hymenium, generally 

 operculate. 



Genus I— L ASIOBOLUS Saccardo. 



Receptacle similar to Ascophanus but externally clothed 

 with sharp pointed hairs. Two species have been collected 

 one of which is very common on the dung of horses and cows 

 in wet places. 



KEY TO THE SPECIES. 



a — Plants minute, hairs abundant, simple . . L. equinus. 



a — Plants larger, hairs few, septate . . . L. raripilus. 



Lasiobolus equinus {Mult.) Karst. 

 Plate XII, fig. i. 



1801 R z 'za papillata Persoon, Syn. Fung. , II, p. 652. 



1823 Peziza papillata Fries, Syst. Myc. , 11, p. 88. 



1889 Lasiobolus equinus Sacardo, Sylloge Fung., VIII, p. 5.36. 



1879 Lasiobolus equinus Engler-Prantl, Pflan. Famil. , I, i, p. 189, fig. 152. 



1600 Lasiobolus equinus Durand, Bull. Torrey Bot. Blub, 27, p. 480. 



1902 Lasiobolus equinus Morgan, Jour. Myc. , 64, p. 182. 



Gregarious, crowded or scattered, minute, sessile, .5 to 1 mm. 

 in diameter, yellowish, externally clothed with numerous, 

 straight, non-septate, colorless spines; asci 8-spored, clavate 

 operculate; sporida elliptical, hyaline, smooth, 20 to 22 by 10 

 to 12 microns, paraphyses slender, septate, granular, simple 

 or branched. 



Habitat — On dung of cows and horses in wet places in sum- 

 mer and fall; also grown in the laboratory. 



This material has been compared with Renin's Ascom. No. 

 1036 which was received by the kindness of Dr. E.J. Durand 

 and seems to be the same. These plants have been collected 

 in large quantities on cow dung in the spring and summer 



