opening by a superior pore; 48-59/x, in diameter, 57-90/i, long. 

 Oospores ellipsoid-globose, ovoid, or angular-globose; wall smooth; 

 42-57^ in diameter, 50-66/a long. Antheridia 8-10/a in diameter, 

 10-18^ long. 

 Mich. 



Oedogonium irregulare Wittrock 1871, p. 128 



Nannandrous; idioandrosporous (?). Vegetative cells cylindric, 

 15-20|Li in diameter, 40-80/i, long. Oogonia solitary; globose or 

 subdepressed-globose; opening by a superior pore; 37-45/x. in diam- 

 eter, 36-47)11 long. Oospores globose; filling the oogonium; wall 

 smooth; 36-42/A in diameter, 34-41/i. long. Antheridia 10-12/i in 

 diameter, 6-8/a long. 



Mich. 



Oedogonium magnum ( Ackley) Tiffany 1934, p. 325 



Nannandrous; idioandrosporous. Vegetative cells cylindric, 14-18/x 

 in diameter, 30-90/x long. Oogonia solitary; subglobose; opening by 

 a supramedian or median pore; 40-43/i, in diameter, 33-38)li long. 

 Oospores globose to subglobose; wall smooth; 38-41)a in diameter, 

 32-36/x long. Antheridia 8-10- (12) /a in diameter, 8-10/^ long. 



Mich. 



Oedogonium multisporum Wood 1869, p. 141 



Nannandrous; idioandrosporous (or gynandrosporous ?). Vegeta- 

 tive cells cylindric, 10-15/x in diameter, 10-30/x long. Oogonia 1-3; 

 subovoid or subglobose; opening by a superior pore; 24-35/a in 

 diameter, 27-SSix long. Oospores globose; nearly filling the oogonia; 

 wall smooth; 27-30/a in diameter, 24-30/x long. Antheridia quadrate, 

 7-9)u. in diameter. 



Mich. 



Oedogonium perfectum (Hirn) Tiffany 1934, p. 326 



[Oe. cijathigerum fa. perfectum Hirn] 



PI. 39, Figs. 6,7 



Nannandrous; idioandrosporous. Vegetative cells cylindric, 20- 



30-(35)ju, in diameter, (65)-92-350)U, long. Oogonia sohtary (or as 



many as 4 in a series ) ; subovate, subquadrangular-ellipsoid, or ovate; 



opening by a superior pore; (65) -66-72- (85) /a in diameter, 70-85- 



(111)/A long. Oospores obovoid; filling the oogonia; outer spore wall 



smooth, middle layer ridged with 16-24 anastomosing and curved 



costae; 59-70- ( 80 )/x in diameter, (65)-70-83-(85))Lt long. Dwarf 



male plants on the suffultory cells, 12-16/x in diameter, 50-58-(S5)ja 



long. 



In swamps. Wis. 



[196] 



