Oedogonium Areschougii Wittrock 1871, p. 122 



Nannandrous; gynandrosporous. Vegetative cells cylindric, (8)- 

 9-12-(13)/i, in diameter, 36-38- ( 75 )/i, long. Oogonia 1-7; depressed- 

 globose or pyriform-globose; operculate; division median; (34)-35- 

 37-(39)/i, in diameter, 36-40/* long. Oospores globose; not filling 

 the oogonia; wall smooth; (22)-23-25-(26)/x in diameter. Dwarf 

 male plants unicellular; on or near the oogonia; 6-7 ju, in diameter, 

 12-13-(15)/*long. 



In a lily pond. Wis. 



Oedogonium Areschougii var. contortofilum Jao 1934a, p. 199 



PI. 40, Figs. 6, 7 



Somewhat larger throughout ( in our specimens ) than the typical 

 plant. Vegetative cells slightly capitellate, forming spiral twists 

 especially just above the oogonial series, in which there may be as 

 many as 7; 7-12-(15.6)/x in diameter, 54-60/* long. Oogonia 36-41/t 

 in diameter, 30-31/i long. Dwarf male plants unicellular; on the 

 oogonia or near them. Oospores globose, 31/t in diameter, 29-30/* 

 long. 



Considerable variation was noted in the amount of twisting 

 exhibited by this variety in different habitats. The suggestion 

 naturally presents itself that the spiral character of the filaments 

 is related to environmental factors. It is known that reaction to 

 parasitism frequently causes bending in filamentous algae, although 

 in these cases no parasitic organisms were observed. 



On submerged wood. Wis. 



Oedogonium ciliatum ( Hass. ) Pringsheim 1856, p. 227 



Nannandrous; gynandrosporous. Vegetative cells cylindric, 14-24/* 

 in diameter, 35-92/* long. Oogonia 1-7; ovate or ovate-ellipsoid; 

 operculate; division superior to supreme; 43-50/t in diameter, 55-72/* 

 long. Oospores ovate to subellipsoid-globose; nearly filling the 

 oogonia; wall smooth; 40-47/t in diameter, 44-57/i long. Antheridia 

 8-10/t in diameter, lO-ll/i long. 



Mich. 



Oedogonium Croasdaleae Jao 1934a, p. 202 

 PI. 41, Fig. 11 

 Nannandrous; gynandrosporous. Vegetative cells cylindrical, (20)- 

 25-28- ( 30 )/t in diameter, 95-105- (230)/* long. Oogonia usually 3-4 

 in a series (rarely solitary); subovate or ellipsoid (sometimes sub- 

 quadrangular-ellipsoid); operculate; division superior; (56)-58- 



[204 1 



