GEDOGONIUM. 85 



OEDOGONIUM HUNTII, Wood. 



Filaments mostly produced into a long apical seta ; oogonia 

 mostly single, globose, now and then hexagonal ; somewhat 

 tumid in the middle ; the lateral pore placed below the mid- 

 dle ; oospore globose, not filling the cavity of the spore-case, 

 its surface with four spiral elevated lines or ridges ; antheridia 

 bi-cellular (sometimes tri-cellular. ) Diameter oospore, 50 //. 



F. W. Algse of U. S., Wood, p. 198. Hitherto have not 

 identified any plant answering this description. 



Plate LXXXIY, fig. 9. 1 



3. Membranes of oospores echinulate. 

 a. Oospores globose. 



OEDOGONIUM STELLATTJM, Wittr. 



Gynaiidrosporous ; oogonia single or 2-3 seriate, oboviform 

 globose, opening by a pore above the middle ; oospore glo- 

 bose, nearly filling the oogoiiium, spinulose, spines conical, 

 spirally disposed ; androsporangia 1-2 celled ; terminal cell 

 somewhat slender and subhyaliue, apex obtuse ; dwarf males 

 rather straight, usually seated on the supporting cell, some- 

 times scattered 5 spermogonia bi-cellular. 



Diameter veg. cells, 15-35 ju ; 2J-5 times longer. 

 Diameter oogon., 51-61 ju by 58-70 yw. 

 Diameter oospor. , with spines, 50-58 /* by 50-58 yw. 

 Diameter androsp. cells, 14-19 yw'by 20-27 p. 

 Diameter stipe dwarf male, 11-13 /* by 45-52 //. 

 Diameter sperm, cells, 6-9 /* by 8-10 //. 



Frequent in Florida waters. 

 Plate LXXXIY, figs. 1. 2, two filaments. 



OEDOGONIUM DONNELLII, Wolle. 



Idio-androsporous ; oogonia single, rarely twin, quadran- 

 gularly globose ; oospore globose, echinulate, spines conical, 

 nearly filling the oogoiiium ; androsporangia 4-10 celled ; 

 dwarf males somewhat curved, stipe two-celled, spermo- 

 gonia two or more celled. Male plants moderately smaller 

 than female. 



Diameter veg. cells, 55-62 yu ; 1-2 times as long. 

 Diameter oogon., 70-75 // by 85-95 yw. 



