opening by a superior pore; 36-48/a in diameter, 48-74/i, long. 

 Oospores subobovoid or subellipsoid; sometimes filling the oogonia; 

 wall smooth; 35-43/a in diameter, 43-59//, long. Antheridia 12-15/x in 

 diameter, 6-10/x long. 



Mich. 



Oedogonium Sodiroanum Lagerheim 1890, p. 81 

 PI. 43, Fig. 12 



Macrandrous; monoecious. Vegetative cells cylindric, 20-24/x in 

 diameter, 44-84/i, long. Oogonia solitary; ellipsoid-ovoid; opening 

 by a superior pore; 40-45/t in diameter, 70-90ja long. Oospores 

 ellipsoid; filling the oogonia in diameter only; wall smooth; 38-42/a 

 in diameter, 56-64/^ long. Antheridia 20-22/x in diameter, 6-8/x long. 



Mich. 



Oedogonium tyrolicwn Wittrock 1875, p. 12 

 PI. 32, Fig. 11 



Macrandrous; monoecious. Vegetative cells cylindric, 16-18.5-(24)/x 

 in diameter, (45) -51. 8-7^ (120)/. long. Oogonia solitary; ellipsoid- 

 globose or depressed-globose; opening by a superior pore; 44.4- 

 45.8- (53)/. in diameter, (51.8) -53-57- (70)/. long. Oospores glo- 

 bose; not filling the oogonia; wall smooth; 40— 42.5— (48)/. in 

 diameter, 40-42.5/^ long. Antheridia 1-4 in series; 11-18-(21)/. 

 in diameter, (5.5) -9-11/. long. 



Attached to grass in a roadside fosse. Wis. 



Oedogonium upsaliense Wittrock 1871, p. 125 

 PI. 43, Fig. 15 

 Macrandrous; monoecious. Vegetative cells cylindric, 13-20/. in 

 diameter, 55-160/. long; suffultory cell somewhat enlarged. Oogonia 

 solitary; obovoid; or suboblong-ellipsoid; opening by a superior 

 pore; 45-50/. in diameter, 66-100/. long. Oospores obovoid or 

 suboblong-ellipsoid; filling the oogonia; wall smooth; 42-47/. in 

 diameter, 60-75/. long. Antheridia 15-18/. in diameter, 7-10/. long. 



Mich. 



Oedogonium varians Wittrock & Lundell in Wittrock 1875, p. 11 



PI. 32, Fig. 10 



Macrandrous; monoecious or dioecious. Vegetative cells cylindric, 

 12-14- (16)/. in diameter, 33-66- (144)/. long. Oogonia solitary or 

 2 together; globose or depressed-globose; opening by a superior 

 pore; (33) -35- (50)/. in diameter, 34-^7- (55)/. long. Oospores 

 globose or depressed-globose; nearly or quite filling the oogonia; 



[181] 



