the oogonia; wall smooth; (37)-38-42-(45)jli in diameter, 38-48- 

 (50) /A long. Antheridia 20-25;la in diameter, 8-10/x long. 



Attached to submerged grass in a pooled seep on bank of a lake. 

 Mich., Wis. 



Oedogonium capilliforme var. australe Wittrock in Wittrock & 



Nordstedt 1886, Algae Exsic. No. 704 



PI. 29, Figs. 5, 6 



Macrandrous; dioecious. Vegetative cells cylindric, 24-31.4- ( 36 )ju, 

 in diameter, (26)-65-103/a long. Oogonia solitary; obovoid-globose; 

 opening by a superior pore; (37) -38-55. 5)u, in diameter, 53-55.5/u, 

 long. Oospores subglobose; not filling the oogonia; wall thick, 

 smooth; 35-50;u, in diameter, 36-55/a long. Antheridial cells 21-26/a 

 in diameter, 4— 9/i, long. 



In a roadside fosse. Wis. 



Oedogonium cardiacum ( Hass. ) Wittrock 1871, p. 135 



PL 29, Figs. 7, 8 



Macrandrous; dioecious. Vegetative cells cylindric, rather stout; 

 18.5-25- (30)/. in diameter, (50)-60-85-(200)/. long. Oogonia soli- 

 tary; globose or subcordiform-globose; opening by a supramedian 

 pore; 48-70/a in diameter, (48)-52-78/x long. Oospores globose; not 

 filling the oogonia; wall thick, smooth; 39-42- (60) /a in diameter. 

 Antheridia (not observed in our collections) 15-21^^ in diameter, 

 10-14/x long. Cell below the oogonium sometimes enlarged in our 

 specimens, 25.9/x in diameter, AS/x long. 



In an acid pond and attached to grass in a swampy pond. Mich., 

 Wis. 



Oedogonium crassum ( Hass. ) Wittrock 1872, p. 20 

 PI. 44, Figs. .9, 10 



Macrandrous; dioecious. Vegetative cells cylindric, 30-42-(50)jli 

 in diameter, (69)-72-340/i, long. Oogonia 1-2; ovate; opening by a 

 superior pore; (60)-65-80/x in diameter, 75-115-(120)|li long. 

 Oospores ellipsoid or ellipsoid-globose; not filling the oogonia; wall 

 smooth; 56-68-(76)/x in diameter, 60-86-(96)/a long. Antheridia 

 (not observed in our collections) 28-33|U in diameter, 8-20)a long. 



Attached to grass in flowing water; in several lakes and ponds. 

 Mich., Wis. 



Oedogonium crenulatocostatum Wittrock 1878, p. 139 



PI. 30, Fig. 7 

 Macrandrous; dioecious. Vegetative cells cylindric, 11.5-13-(18)/i, 

 in diameter, 25-51-(125)/x long. Oogonia 1-6; obovoid or ellipsoid; 



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