diameter, 54-80/a long. Oospores globose or subglobose; not filling 

 the oogonia; wall smooth; 47-58/i, in diameter, 47-65/^ long. Antheri- 

 dia 32-38/A in diameter, 5-20/^ long. 

 Mich. 



Oedogonium rivulare (Le CI. ) A. Braun 1856, p. 23 

 PL 32, Figs. 5, 6 



Macrandrous; dioecious. Vegetative cells cylindric, (35)-40-45|a 

 in diameter, (110)-160-185-(350)/x long. Oogonia solitary or 3-7 

 in a series; obovoid-ellipsoid; opening by a superior pore; (70)-85/a 

 in diameter, (84)-118.4-160/i, long. Oospores ellipsoid or subglobose; 

 much smaller than oogonia; wall thick, smooth; (55)-66.6-70/a in 

 diameter, (65) -83.5-1 00/^ long. Male filaments with cells 30-36/la 

 in diameter, 120-280/x long. Antheridia 21-28ju, in diameter, 14-26/i. 

 long. 



Attached to submerged aquatics. Wis. 



Oedogonium rufesce^is Witti'ock 1871, p. 134 

 Macrandrous; dioecious. Vegetative cells cylindric, slender; 8-10/x 



in diameter, 34-70/x long. Oogonia 1-3; obovoid or depressed-obo- 



void-globose; opening by a median pore; 22-24//, in diameter, 22-30;u. 



long. Oospores globose or depressed-globose; filling the oogonia; 



wall smooth; 21-23ju, in diameter, 17-22/i, long. Antheridia 6-8|U, in 



diameter, 8-12/^ loJ^g- 

 Mich. 



Oedogonium sociale Wittrock in Wittrock & Nordstedt 

 1882, Algae Exsic. No. 401 

 PI. 32, Figs. 7-9 

 Macrandrous; dioecious. Vegetative cells cylindric, (9)-15.5-16ju, 

 in diameter, (30)-74-130/i, long. Oogonia solitary; subglobose or 

 ellipsoid-globose, opening by a median pore; (30)-37-38-(40);a 

 in diameter, (33)-41-43/a long. Oospores globose or broadly ellipsoid- 

 globose; nearly filling the oogonia; wall smooth; (26)-30-32-(35);U, 

 in diameter, (26)-32-36/a long. Antheridia 12-14/x in diameter, 10/x 

 long. 



Attached to grass in small lake. Wis. 



Oedogonium suecicum Wittrock 1872a, p. 6 



PL 33, Figs. 4, 5 



Macrandrous; dioecious. Vegetative cells cylindric, 9-12.9- ( 14 )ju, 



in diameter, (30)-37-44-(90))li long. Oogonia solitary; subglobose; 



opening by a median pore; (32) -33.3-37- (38)/! in diameter, 



( 34) -40.7-41- ( 44 );li long. Oospore globose; not quite filling the 



[174] 



