Section 5 



Nannandrous — Idioandrosporous — Poriferous 



Oedogonium cyathigerum Wittrock 1871, p. 131 



Nannandrous; idioandrosporaus. Vegetative cells cylindric, 21-30)u, 

 in diameter, 40-300/x long. Oogonia 1-3; subovate; opening by a 

 superior pore; 57-65;a in diameter, (70) -77-100^ long. Oospores 

 subovoid or quandrangular-ellipsoid; outer spore wall smooth 

 middle layer with 16-25 longitudinal ribs; 51-62/* in diameter, 

 6(>-75/>i long. Dwarf male plants 10-15/x in diameter, 50-58/x long. 



In swamps. Mich., Wis. 



Oedogonium cyathigerum fa. ornatum (Wittr.) Hirn 1900, p. 254 



PL 44, Fig. 13 

 A form somewhat larger throughout than the typical plant and 

 with dwarf males more elongate. 

 With the typical plant. Wis. 



Oedogonium gallicum Hirn 1900, p. 197 

 PI. 39, Fig. 4 



Nannandrous; idioandrosporous. Vegetative cells cylindric, 16- 

 18.5-(22)ju, in diameter, 51-65-(120)/i, long. Oogonia solitary (rarely 

 2 together); globose; opening by a median or supramedian pore; 

 (39) -45-48/1 in diameter, 40-45- ( 54 )/* long. Oospores depressed- 

 globose; filling the oogonia; wall thick, smooth; 36-46/a in diameter, 

 39-44/A long. Dwarf male plants 2-celled, on the suffultory cells. 

 Antheridia exterior, 11.7/t in diameter, 10-13/x long. Suffultory cell 

 18/x in diameter, 51/i long. 



In waterlily pond. Mich., Wis. 



Oedogonium hijstricinum Transeau & Tiffany 1919, p. 240 



Nannandrous; idioandrosporous. Vegetative cells cylindric, 8-15/* 

 in diameter, 42-100/* long. Oogonia solitary; globose or obovoid; 

 opening by a median pore; 30-40/* in diameter, 35-53/* long. 

 Oospores globose or subglobose; outer wall densely spiny; 23-38/* 

 in diameter, 28-43/* long. Antheridia 5-6/* in diameter, 6-10/* long. 



Mich. 



Oedogonium idioandrosporum (Nordst. & Wittr.) 

 Tiffany 1934, p. 325 



Nannandrous; idioandrosporous. Vegetative cells cyhndric, 25-36/* 

 in diameter, 65-200/* long. Oogonia 1-3; globose-obovoid to globose; 



[195] 



