50 NATURAL HISTORY BULLETIN 



MOBCHELLA Pers., Tent. Disp. Meth. Fung. 36. 1797. 

 KEY TO THE SPECIES. 



Pileus free half way up M. hybrida.. 



Pileus not free. 



Stem much smaller than the head, ribs thick, pits deep. 

 Plants large, more than 4 cm. high, usually yellow. 



Pits irregular, head rounded M. esculent a 



Pits longitudinally inclined, head conical. . . M. conica. 

 Plants small, usually much less than 4 cm. high, 



cinereous -3f- deliciosa. 



Stem very much enlarged below, ribs very thin, 



pits shallow M. crassipes- 



*Morchella hybrida (Sow.) Pers., Syn. Fung. 620. 1801. 



Plate 3, f. ii. 



Helvella hybrida Sow., Eng. Fungi, 238. 1797. 



Morchella esculenta (L.) Pers., Syn. Fung. 618. 1801. 



Plate 2, f. in. 



Phallus esculentus Linn., Fl. Suec. 455. 1755. 



Pileus rounded, ovate or oblong, adnate at the base, ribs thick p 

 pits large, deep, irregular; stem even, not much enlarged at the 

 base; asci cylindrical, 8-spored; spores elliptical, 20-22 by 10^; 

 paraphyses filiform, slightly thickened above. 



On the ground in open places among grass, spring, Iowa City 

 and Mt. Pleasant. Probably common throughout the state. 



This is much valued on account of its edible qualities and is 

 often gathered in large quantities for this purpose The species- 

 is common and the plants very variable in form and size. 



*Morchella conica Pers.. Trait. Champ. 257. 1818. 



Plate 3, f. i. 



aTorchella deliciosa Fries, Syst Myc. 2 :8. 1822. 



Plate 2. f. ii. 



Pileus subconical, ribs rather thick, longitudinally inclined,, 

 deep, rather dark colored "within, grayish, with the edges of the 

 ribs lighter, yellowish ; stem short, scarcely as long as the pileus, 



*Species are described in the preliminary paper already named. 



