narrow (sometimes wide in our specimens); (23) -25-26- (29) /a in 

 diameter, (19)-29-30/x, long. Oospores depressed-globose; nearly 

 filling the oogonia; wall smooth; 22.5-27/a in diameter, 17-18.5- ( 23 )/x 

 long. Antheridia 7.6-9|U, in diameter, 3.8-ll-(12)/x, long. 

 Attached to grass in a small pond. Wis. 



Oedogonium inclusum Hirn 1895, p. 21 

 Macrandrous; monoecious. Described in previous section. 



Oedogonium Itzigsohnii DeBary 1854, p. 56 



Macrandrous; monoecious. Vegetative cells cylindric, 8-10/x in 

 diameter, 25-50/* long. Oogonia solitary; ellipsoid, with a median 

 whirl of cone-shaped projections; operculate; division inframedian; 

 34-40/i, in diameter, 32-40/* long. Oospores globose; not filling the 

 oogonia; wall smooth; 20-23/t in diameter. Antheridia 8-9/* in 

 diameter, 8-15/* long. 

 Mich. 



Oedogonium minisporum Taft 1939, p. 80 

 PI. 43, Fig. 1 



Macrandrous; monoecious. Vegetative cells capitellate, 6-14/* in 

 diameter, 53-69/* long. Oogonia 1 or 2; subpyriform-globose to 

 subglobose; operculate, opening median; 30-42/* in diameter, 34-42/t 

 long. Oospores globose to subglobose; not filling the oogonia; wall 

 smooth (yellow); 25-30/* in diameter, 24-29/* long. Antheridia 8-1 l/i 

 in diameter, 7-9/* long. 



Presque Isle County, Michigan. 



Oedogonium minus (Wittr. ) Wittrock 1875, p. 9 

 PI. 34, Figs. 7-9 



Macrandrous; monoecious. Vegetative cells capitellate; walls 

 spirally punctate; ( 9 )-12-13/* in diameter, (30) -^5-74- (78)/* long. 

 Oogonia solitary, globose or pyriform-globose; wall with spiral 

 punctations (in our specimens, with projections, as if mucilaginous 

 concretions had formed at the punctations); operculate; division 

 median; (34) -35-40- (46)/* in diameter, (28)-30-40-(42)/t lon^. 

 Oospores depressed-globose; not filling the oogonia; wall smooth; 

 30-35-(42)/* in diameter, (26) -30-33- (36)/* long. Antheridia 9-13/* 

 in diameter, 3-5/t long ( in series of up to 10 ) . 



In a roadside fosse. Mich., Wis. 



[191] 



