CEDOGONIUM. 93 



SECTION III. SPECIES OF WHICH THE ORGANS OF 

 FRUCTIFICATION ARE IMPERFECTLY KNOWN. 



a. Oospores globose or subglobose. 



OEDOGONIUM DELICATULUM, Kg. 



Oogonia single, subglobose, inflated, ends somewhat drawn 

 out, or extended, oospore perfectly globose ; usually affixed 

 by a discoid base. 



Diameter veg. cells, 5-6 // ; 3-4 times longer. 

 Diameter oogon., 17-18 // by 20 ^. 

 Diameter oospor. , 12-14 // by 12-14 p. 



Often parasitic on larger forms of Oedogonia. 

 Plate LXXXI, figs. 12, 13. 



OEDOGONIUM MONILIFORME, Wittr. 



Oogonium single or 2-5 seriate, subglobose, or obovate- 

 globose, opening by pore above the middle ; oospore globose 

 or obovate-globose, nearly filling the oogonium, membrane 

 of oospore thick and often indistinctly verrucose. 



Diameter veg. cells, 9-11 yw ; 3-5 times longer. 

 Diameter oogon., 24-28 /* by 28-35 //. 



Stagnant waters, not frequent. 

 Plate LXXXI, figs. 14, 15. 



OEDOGONIUM FONTICOLA, A. Br. 



Oogonium single, rarely twin, globose-obovate, opens by 

 pore above the middle ; vegetative cells often very variable 

 in length and in breadth in different parts of the same fila- 

 ment ; usually a deep -green. 



Diameter veg. cells, 16-38 /* ; 12-15 yu long. 

 Diameter oogon. , 36-40 JLI by 44-45 yw. 



Frequent in stagnant or sluggish waters, also in spring 

 water. The largest form figured was found fringing a basin 

 hewn in slate rock for cold spring water. 



Plate LXXV, figs. 4, 5, 6. 



OEDOGONIUM PRINCEPS, (Hass.) Wittr. 



Oogonia single, subobovate-globose, opening by a pore 

 above the middle ; oospore globose, not quite filling the 

 oogonium. 



