Antheridia exterior, 6-8/x in diameter, 5-6/i, long. Suffultory cell 

 (26) -32-34)11 in diameter, (46)-50-53.6-(80))a long. 

 Attached to grass in a small northern pond in sand hills. Wis. 



Oedogonium macrandrium Wittrock 1871, p. 130 

 PI. 41, Fig. 1 



Nannandrous idioandrosporous (or gynandrosporous?). Vege- 

 tative cells cyhndric, 14.8-16- ( 20 )/x in diameter, 40-51.8- ( 100 )/x 

 long. Oogonia 1—4; sub-globose or ovate-globose; operculate; di- 

 vision superior; 36— 42/i, in diameter, (43)— 48— 154/a long. Oospores 

 globose; wall smooth; (31)— 34— 37//. in diameter. Dwarf male 

 plants 2- or 4-celled; stipe 14.8/a in diameter, 33.3/a long; scattered 

 on the female plant. Antheridia exterior, 7.4— IO/a in diameter, 

 7-10/A long. 



In soft water bog lakes. Mich., Wis. 



Oedogonium michiganense Tiffany 1927, p. 205 

 PI. 43, Figs. 9-11 

 Nannandrous; gynandrosporous. Vegetative cells capitellate, 12- 

 24/x in diameter, 80-160/^ long. Oogonia 1-7; globose to ellipsoid- 

 globose; operculate; division supreme; 50-64|U, in diameter, 50-80ju, 

 long. Oospores globose; sometimes filling the oogonia; wall smooth; 

 44-60/A in diameter. Dwarf males 13-20;a in diameter, 40-56/* long. 

 Mich. 

 Oedogonium monile Berkeley & Harvey in Hooker 1859, p. 342 



Nannandrous; gynandrosporous (?). Vegetative cells cylindric, 

 sometimes capitellate; 9-15/x in diameter, 50-160/x long. Oogonia 

 1-8; subovate or subglobose; operculate; division superior; 30-39/x, 

 in diameter, 30-56/x long. Oospores globose or subglobose; outer 

 spore wall smooth, median wall scrobiculate; 28-38/x in diameter. 

 Antheridia quadrate, 7/t in diameter. Suffultory cell 21— 29— (32) jit 

 in diameter. 



Mich. 



Oedogonium oelandicum Wittrock 1875, p. 17 



Nannandrous; gynandrosporous. Vegetative cells capitellate, 10- 

 15/x in diameter, 25-125iU, long. Oogonia 1-7; depressed-globose, with 

 12-16 prominent longitudinal ribs in the median portion; operculate; 

 division supramedian and broad; (29)-31-40/i, in diameter, 25-32/* 

 long. Oospores depressed-globose; almost completely filling the 

 oogonia; wall smooth; 25-36/t in diameter, 23^0/x long. Dwarf male 

 plants unicellular; on the oogonia; 7-8/x in diameter, 12-15/x long. 



Mich. 



[ 206 ] 



