THE GREEN ALGAE OF NORTH AMERICA 271 



veg. cell, 13-18 M diam., 1,5-2-2 y, diam. long, 



oog., 36-42 n " 33-39 M long, 



andr. cell, 10-11 M " 9-10 n . " 



nan., 8-9 M " 18-21 M " 



Europe, Africa. 

 American only by Wolle's reference. 



8. B. SETIGERA (Roth) Agardh, 1-817, p. 71; Wolle, 1887, 

 p. 98, PL LXXXVI, fig. i ; Wittr. and Nordst, Alg. Exsicc., 

 No. 702 ; Him, 1900, p. 339, PI. L/V, fig. 351. Dioecious, nan- 

 nandrous, gynandrosporous ; oogonia sub-depressed- or de- 

 pressed-quadrangular-globose, patent, generally below terminal 

 setae, more rarely below androsporangia or vegetative' cells ; 

 membrane of oospore thickened ; dissepiment of suffultory cells 

 usually slightly above median ; epispore of oospore pitted ; 

 androsporangia scattered or more rarely epigynous, i-3-celled ; 

 dwarf males on oogonium or near it ; antheridium interior, 

 stipe slightly curved, shorter than the antheridium. 



veg. cell, 25-28 /a diam., 2)4-5 diam. long, 



oog., 70-80 M " 56-65 M long, 



andr. cell, 16-20 fj. " 10-18 /u. " 



nan., 11-14 M " 30-36 ^ " 



Conn., N. J., Fla., S. C. Europe, So. America. 



B. Canbyi Wood, 1872, p. 202, Pi. XVI, fig. 6, is considered 

 by Hirn to be included in this species. 



9. B. CRASSIUSCULA Nordstedt, 1877, p. 30, PL III, figs. 14- 

 15; Hirn, 1900, p. 341, PL L,V, fig. 352; Wittr. and Nordst., 

 Alg. Exsicc., No. 703. Dioecious, nannandrous, idioandro- 

 sporous ; oogonia depressed-subquadrangular-globose, patent, 

 below terminal setae or more rarely vegetative cells ; dissepi- 

 ment of suffultory cells superior, rarely submedian ; epispore 

 of oospore pitted ; androsporangia 1-4- celled ; dwarf males on 

 oogonium or near it ; antheridium interior, stipe slightly curved, 

 shorter than the antheridium. 



veg. cell, 22-27 /a. diam., 2)4-5)4 diam. long, 



oog., 60-78 M " 50-62 ,u long, 



anth. cell, 16-19 /u. " 10-13 M " 



nan., 12-14 M " 30-34 fj- " 



Greenland. Europe, Australia. 



10. B. GIGANTEA Pringsheim, 1858, p. 71, PI. VI, fig. i ; 

 Wolle, 1887, p. 99, PL L-XXXVII, fig. i ; Hirn, 1900, p. 347, PL 

 LVII, fig. 359. Dioecious, nannandrous, idioandrosporous ; 

 oogonia sub-depressed-globose or depressed-oboviform-globose, 

 patent, below terminal setae, rarely below vegetative cells; dis- 



