Sumstine: North American Mucorales 137 



I. Hydrogera oblioua (Scop.) O. Kuntze, Rev. Gen. PL 

 2:855. 1891 

 Mucor obliquus Scop., Fl. Carn. 2 : 494. 1772. 

 Hydrogera crystallina Web. and Wigg., /. c. 1780. 

 Pilobolus crystallinus (Web. and Wigg.) Tode, /. c. 1784. 

 f Mucor urceolatus Dicks., PI. Crypt. Brit, i : 25. 1785. 



Scopoli gives a good description of this species and Weber and 

 Wiggers cite his species as follows, ''Mucor obliquus Scop. 

 Carn. n. J(5^J cum nostra convenit." Tode bases his genus on 

 Hydrogera crystallina and cites as a synonym Mucor obliquus. 



The sporangium rests somewhat on the side of the subspo- 

 rangial swelling. The mycelial swelling is buried in the 

 substratum. 



Substrata : On dung of horse. 



Specimens examined: Pennsylavnia Ellis & Ev. N. A. F. 

 8 J I, Sumstine; New York, Sumstine. 



Illustrations : Tode, /. c. pi f. 1-7; Link, Ges. Naturf . 

 Freunde Berl. Mag. 3 : pL 2, f. 49^50; Bull. Herb. Fr. pi. 480, 

 f. I. 



2. Hydrogera Kleinii (Van Tieghem) O. Kuntze, /. c. 1891 

 Pilobolus Kleinii Van Tieghem, Ann. Sc. Nat. VI. 4: 337. 1876. 



This species is nearest H. obliqua but may be distinguished by 

 the form of the spores, by the mycelial swelling, and by the 

 smaller sporangiophores. 



Substrata: On horse dung. 



Specimens examined : Pennsylvania, Sumstine. 



Illustrations : Van Tieghem, /. c. pi. 10, f. 6-10. 



3. Hydrogera longipes (Van Tieghem) O. Kuntze, /. c. 1891 

 Pilobolus longipes Van Tieghem, /. r. 6, 4: 338. 1876. 

 Pilobolus roridus Bref. Bot. Unters. 4: 70. 1881. 



This species is possibly mistaken for one of the other species 

 and therefore has not been previously reported for America. 

 The long swelling at the base of the sporangiophore and the 

 elliptic-spherical spores are determinative characters. 



Substrata: On horse dung. 



