superior; 28-33/a in diameter, 36-50/a long. Oospores pyriform-ovate; 

 not filling the oogonia; wall smooth; 25-30^ in diameter, 28-35/u, 

 long. Antheridia (?). 

 Mich. 



Oedogonium Smithii Prescott 1944, p. 353 



PI. 36, Figs. 17-19 



Macrandrous; dioecious (?). Vegetative cells cylindric or irreg- 

 ularly inflated, 3.7-8/x in diameter, 13-25/a long. Oogonia solitary; 

 broadly pyriform-fusiform, with a secondary lateral inflation in the 

 upper portion; operculate; division median and wide; 22-25/x, in 

 diameter, 27-32/t long. Oospores depressed-globose; nearly filling 

 the oogonia laterally; wall smooth; 16-18fi in diameter, 12.9-14)U, 

 long. Antheridia (?). 



This plant should be compared with Oe. inconspicuum, from 

 which it is distinguished by the pyriform oogonium with its lateral 

 inflations. 



Rare; in a roadside pond. Wis. 



Oedogonium spurium Hirn 1900, p. 301 

 PI. 37, Figs. 4, 5 

 Macrandrous; monoecious or sometimes dioecious. Vegetative cells 

 capitellate, 7-13/i, in diameter, 20-55//, long. Oogonia sohtary; sub- 

 globose to depressed-globose; operculate; division supramedian; 

 26-30fi in diameter, 23-33/^ long. Oospores depressed-globose; some- 

 times filling the oogonia; wall smooth; 23-28/i in diameter, 21-26- 

 (28)/A long. Antheridia 7-8/a in diameter, S-ll/i long. 

 Mich., Wis. 



Oedogonium tapeinosporum Wittrock 1875, p. 40 

 PI. 38, Figs. 11, 12 



Macrandrous; dioecious (?). Vegetative cells cylindric, (2)-3.7- 

 5.5/x in diameter, 12-25-(40)/x long; basal cell hemispherical. Oogonia 

 solitary; globose, depressed-globose, or subelliptic (shape varies in 

 the same plant); operculate; division median; (14) -18.5-1 9/i, in 

 diameter, (14)-20-23-(25)ia long. Oospores globose or depressed- 

 globose; not filling the oogonia; wall smooth; (13)-14-15/a in 

 diameter, 9-14-(18)/x long. Antheridia unknown. 



This plant should be compared with Oe. inconspicuum Hirn, 

 especially small specimens, which are easily confused with large 

 individuals of the latter species. 



In shallow water of swamps and in a slough. Mich., Wis. 



[188] 



