Micological Flora. 343 



On the under side of half-buried rotten logs, in woods 

 May. 



638. Peziza bicolor. Bull. 

 "Two-colored Peziza." 



Subsessile, nearly spherical, heavily tomentose, external- 

 ly white; disc little tinged with yellow, very small, with a 

 glass of 50 appears about 6 lines broad; stipe about 8 lines 

 high, attenuated downwards. 



On decayed twigs, buried beneath rotten logs, in woods. 

 May. 



639. Peziza diplocarpa. Curr. 

 "Double fruited Peziza." 



Our plant is pale orange or brown, not greenish olive; 

 gregarious, perfectly covering, sometimes, large patches of 

 earth. 



On recently burned ground, Highland Park. Oct. 



CALYCELLA. Fries. 



640. Helotium tuba. Ft. 

 "Tube Helotium." 



Plant y 2 inch high; on twigs on the ground. July to 

 September. 



FRESH-WATER ALG^. 



Genus DOLICHOSPERMUM. Thwaites. 



1. D. SUBRIGIDUM. Wood. 

 This species I have found growing in the scum floating 



on water in ditches and in the coffer dam on Nicollet Island. 



Genus GLOIOTRICHIA, J. Ag. 1842. 



2. G. INCRUSTATA. Wood. 

 Found attached to small water plants along the Henne- 

 pin Island shore of the east branch of the Mississippi River. 



