superior pore; 39-48;u in diameter, 60-84/x long. Oospores ellipsoid; 

 filling the oogonia; outer and median wall layers with 27-35 longi- 

 tudinal ribs; 36-45/x in diameter, 54-63/. long. Antheridia 14-16/x 

 in diameter, 6-13/* long. 

 Mich. 



Oedogonium patulum Tiffany 1934, p. 324 

 PL 33, Fig. 8 

 Macrandrous; monoecious. Vegetative cells capitellate, (13)-14- 

 15-(16)/. in diameter, (35) -37-50- (60)/. long. Oogonia solitary; 

 globose or subglobose; opening by a superior pore; 38-40/. in 

 diameter, 38-40/. long. Oospores globose; nearly filling the oogonia; 

 wall smooth; (33)-35-3&-(38)/. in diameter, (33) -35-36- (38)/. 

 long. Antheridia 12-14/. in diameter, 5-6/. long. 

 In a roadside fosse. Wis. 



Oedogonium plusiosporum Wittrock 1875, p. 11 

 PL 33, Figs. 1-3 

 Macrandrous; monoecious. Vegetative cells cylindric, (12)-15.6- 

 18-(19)/. in diameter, (24) -50-58- (77)/. long. Oogonia solitary; 

 globose or subellipsoid-globose; opening by a superior or suprame- 

 dian pore; (28) -41-42- (45)/. in diameter, (35) -46-48- (50)/. long. 

 Oospores globose; filling the oogonia; wall smooth; (25)-35-39-(45)/. 

 in diameter, 30-39/. long. Antheridia 12/. in diameter, (8)-10-12/t 

 long. 



Attached to aquatic moss and other vegetation. Wis. 



Oedogonium pseudo-Boscii Hirn 1895, p. 21 

 PL 35, Fig. 4 



Macrandrous; monoecious. Vegetative cells slender and cylindric, 

 8-14/. in diameter, 64-275/. long. Oogonia solitary; subovoid or 

 pyriform, unsymmetrically bulged in the lower portion; opening 

 by a superior pore; 41-50/i in diameter, 75-105/i long. Oospores 

 ovoid or oval to ellipsoid-ovoid; filling and extending the oogonia 

 in the basal part; 38-45/t in diameter, 48-60/. long. Antheridia 

 quadrate, 11-12/. in diameter, 10-11/. long. 



Attached to submerged aquatics. Wis. 



Oedogonium Richterianum Lemmermann 1895, p. 26 



PL 43, Fig. 8 

 Macrandrous; monoecious. Vegetative cells cylindric, 12-21/i in 

 diameter, 36-126/. long. Oogonia 1-2, obovoid or subellipsoid; 



[180] 



