by a superior pore; 51-64/x in diameter, 56-70/j, long. Oospores 

 globose; filling the oogonia; outer wall spirally striated with ribs; 

 50-5S/A in diameter, Antheridia 6-9fi in diameter, 8-13/i, long. 



Mich. 



Oedogonium suhsexangulare Tiffany 1934, p. 325 

 PL 39, Fig. 5 



Nannandrous; gynandrosporous. Vegetative cells cylindric, (15)- 

 19-24^ in diameter, (20) -30- (68)^ long. Oogonia solitary; sexan- 

 gular; opening by a median pore; 35-38- (48) /a in diameter, (41)- 

 45-50/1, long. Oospores the same shape as the oogonia and filling 

 them; 34-40/a in diameter, (39)-40-43-(48)/>i long; the wall smooth. 

 Dwarf male plants with elongated stipes. Antheridia 6-8/x in 

 diameter, 8-10/* long. 



Floating clots of filaments in a small pond. Wis, 



Section 7 

 Nannandrous — Idioandrosporous or Gynandrosporous — Poriferous 



Oedogonium Borisianum ( LeCl. ) Wittrock 1875, p. 25 



PI. 35, Figs. 8, 9 



Nannandrous; gynandrosporous or idioandrosporous. Vegetative 

 cells cylindric, (15) -18.5-24/. in diameter, (45) -55-59- (140)/. long. 

 Oogonia 1-5; obovoid or angularly ellipsoid; opening by a superior 

 pore; (33)-40-50/i, in diameter, 55-90/i. long. Oospores obovoid; 

 filling the oogonia in diameter but not in length; wall thick, smooth; 

 (35) -47-49/. in diameter, (48) -55.5-57- (60)/. long. Dwarf male 

 plants on the much enlarged suffultory cell. Antheridia exterior; 

 8-10/. in diameter, (11) -12-15- (16)/. long. Suffultory cell 37/. in 

 diameter, 55- (92)/. long. 



Common in several swamps and small lakes. Mich., Wis. 



Oedogonium echinospermum A, Braun in Kuetzing 1849, p. 366 



PI. 35, Figs, 10, 11 



Nannandrous; gynandrosporous or idioandrosporous. Vegetative 

 cells cylindric, 18-21-(30)/. in diameter, (45)-62-130/. long, Oogonia 

 depressed-globose or ellipsoid-globose; opening by a median pore; 

 (39) -50-54.6/. in diameter, (41)-46-49-(57)/. long. Oospores globose 

 or depressed-globose; the outer wall furnished with short, sharp 

 spines; (38) -46-47/. in diameter, (38) -40-44- (49)/. long. Dwarf 

 male plants on the suffultory cell. Antheridia exterior, 6-9- (12)/. in 

 diameter, 6-1 1-( 15)/. long. 



On overhanging grass in a ditch through a Sphagnum bog. Mich., 



Wis. 



[199] 



