62-(77))Li in diameter, 86-96-(116))a long. Oospores filling the 

 oogonia and the same shape; outer spore wall smooth; middle layer 

 with coarse, anastomosing, longitudinal costae; (54) -55-62- (73)/^ 

 in diameter, (77) -79-94- (105) /a long. Dwarf male plants 10-15/t 

 in diameter, 55-60- ( 62 )/x long. 



In a roadside swamp; attached to submerged aquatics in a beach 

 pool. Wis. 



Oedogonium decipiens Wittrock 1871, p. 126 

 PI. 42, Figs. 13, 14 



Nannandrous; gynandrosporous. Vegetative cells cylindric or 

 slightly capitellate, (9 )-10-12yii in diameter, ( 28) -30-78- ( 80 )/t long. 

 Oogonia solitary; subglobose; operculate; division median; (30)- 

 33-36- ( 38 )/>t in diameter, (27)-30-40/x long. Oospores depressed- 

 globose, (25)-28-33-(34);a in -diameter, (23) -25-28- (30) /a long. 

 Dwarf male plants unicellular, 7/x in diameter, 13-14-(15)^ long. 



In several soft water and acid habitats. Mich., Wis. 



Oedogonium decipiens var. africanum TifiFany 1929, p. 74 



PI. 41, Fig. 2 

 Vegetative cells capitellate; filaments frequently twisted; 9-9.2- 

 (13)/x in diameter, 25-30-(60)/x long. Oogonia globose; (25)-29.6- 

 32^ in diameter, (23) -27-28. 6/x long. Antheridia 6/a in diameter, 

 7/A long. 



On overhanging grass. Wis. 



Oedogonium decipiens var. dissimile (Him) Tiffany 1937, p. 68 



PI. 42, Figs. 11, 12 



Vegetative cells capitellate, 8-11- (14)^ in diameter, (20)-55- 

 (65)/. long; oogonia (28) -33. 3-35/. in diameter, (23)-29.6-38/t 

 long; oospores (23) -30- (34)/. in diameter, 21-(30)/. long. Andro- 

 sporangium 9.2/. in diameter, 8/i, long. Antheridia 8/. in diameter. 



Common in swamps and lakes. Mich., Wis. 



Oedogonium hians Nordstedt & Hirn in Him 1900, p. 227 

 PI. 40, Fig. 10; PL 42, Fig. 10 

 Nannandrous; gynandrosporous. Vegetative cells slightly capitel- 

 late, 9-14.8-(18)/. in diameter, 37-48-(145)/x long. Oogonia 1 or 2; 

 subglobose or subovoid; operculate; division superior; 37-43/x in 

 diameter, (40) -45-60- (80)/. long. Oospores globose; quite or nearly 

 filling the oogonia; wall smooth; 30-31. 4- (40)/* in diameter, 32-34- 

 (40)/. long. Dwarf male filaments 2-celled, on the suffultory cell. 



[205] 



