THE GREEN ALGAE OF NORTH AMERICA 249 



similar to that of Oe. Boscii, but is distinguished by the opercu- 

 late oogonium, as well as by other characters. 



NANNANDRIA, ANTHERIDIUM EXTERIUS, PORIFERA, 

 GLOBOSPORA. 



43. OE. BRAUNII Kiitzing, 1849^.366; Wolle, 1887, p. 79, 

 PI. LXXIX, figs. 6 and 7; Him, 1900, p. 194, PI. XXXII, 

 fig. 197; Wittr. and Nordst., Alg. Exsicc., No. 15. Dioecious, 

 nanuaudrous, gynandrosporous ; oogonia single, ellipsoid or 

 subglobose, pore median ; oospore globose, not quite filling the 

 oogonium, membrane smooth ; suffultory cell slightly or not 

 swollen ; androsporangia i-2-celled ; basal cell elongate, ter- 

 minal cell obtuse ; dwarf males near the oogonia, often on the 

 suffultory cell, stipe sometimes 5-celled, antheridium external, 

 unicellular, stipe slightly curved. 



veg. cell, 13-15 M diatn., 2-4 diam. long, 



suf. cell, 16-20 M " i%-2% " " 



oog., 30-37 /j. " 33-43 /a long, 



oos., 27-33 M " 27-33 M " 



andr. cell, 13-15 /" " 11-12 /j. " 



nan. stipe, 7-12 /u " 20-28 M " 



anth. cell, 5-8 AC " 9-10 /u " 



N. J., Pa. Europe, Africa. 



44. OE. FLAVESCENS (Hass.) Wittrock, 1870, p. 127, PI. 

 LIII, fig. 9; Wolle, 1887, p. 78, PI. IvXXVIII, figs, i and 2; 

 Hirn, 1900, p. 196, PL XXXII, fig. 199. Dioecious, nannan- 

 drous, idio- or gynandrosporous ; oogonia single, ellipsoid or 

 subglobose (sometimes sub-hexagonal-globose), pore median ; 

 oospore globose, not quite filling the oogonium, membrane 

 smooth ; suffultory cell similar to other veg. cells ; androspor- 

 angia i-9-celled ; dwarf males slightly curved, on the suffultory 

 cell, autheridium external, i- (or 2-) celled. 



veg. cell, 18-23 M diarn., 4-6 diam. long. 



oog., 49-52 /" " 51-60 M long. 



oos., 45-49 /* " 45-49 v- ' 



andr. cell, 17-20 M " 8-18 M ' 



nan. stipe, 11-12 /x " 36-45 M 



anth. cell, 9-10 M " 15-20 M " 



Mass., Minn. Sweden. 



'Somewhat like the preceding species in character, but of 

 larger dimensions ; the oogonium is often of hexagonal form 

 when young, later becoming globose. 



45. OE. PUNGENS Hirn, 1900, p. 199, PL XXXII, fig. 203. 



