THE GREEN AI,GAE OF NORTH AMERICA 229 



69. Oogonium 20-27 <" diam. 65. Oe. Rothii. 



69. Oogonium 30-38 M diam. 70. 



70. Oospore depressed. 66. Oe. decipiens. 



70. Oospore globose. 74. Oe. londinense. 



MACRANDRIA, PORIFERA, GLOBOSPORA. 



1. OE. CRYPTOPORUM var. VULGARE Wittrock, 1874, p. 7; 

 Him, 1900, p. 73, PI. I, fig. 2 ; Wolle, 1887, p. 70, PI. LXXIV, 

 figs. 1-2; P. B.-A., No. 1525. Monoecious; oogonia single or 

 more usually 2-5 seriate, oboviform-globose or depressed-glo- 

 bose, opening by a median pore ; oospore depressed-globose, 

 nearly filling the oogonium ; membrane smooth ; antheridia 

 1-4 celled, subepigynous, hypogynous or scattered ; spermato- 

 zoid single. 



veg. cell, 5-8 M diam., 3-6 diam. long. 



oogonia, 18-23 /x " 18-26 ti long. 



oospores, 16-23 /* " I 5- I 9 M " 



anth. cell, 5-7 /u " 9-12 M " 



Mass., Pa., N. J., sec. Wolle. Europe, Australia. 



The type, with somewhat larger measurements in every direc- 

 tion, oogonia single, antheridia 1-7 celled, occurs in northern 

 Europe, but has not been found here. 



2. OE. RUFESCENS Wittrock, 1870, p. 134; Wolle, 1887, p. 

 89, PI. L,XXXI, figs. 16 and 17 ; Him, 1900, p. 76, PI. I, fig. 4 ; 

 P. B.-A., No. 521. Monoecious; oogonia single or 2-3, obovi- 

 form- or depressed-oboviform-globose, pore median ; oospore 

 globose or depressed-globose, filling the oogonium or nearly so, 

 membrane smooth ; male plants slightly more slender than the 

 female ; antheridia up to i2-celled ; spermatozoid single. 



veg. cell, female, S-iOitdiam., 4-7 diam. long. 



veg. cell, male, 7-9 M " 4-6 



oog., 22-24 M " 22-30 M long. 



oos., 21-23 /j. " 17-22 n " 



anth. cell, 6-8 ^ " 8-12 M " 



R. I., Conn. Europe. 



Subsp. IvUNDELiyii (Wittr.) Him, 1900, p. 77, PI. I, fig. 6; 

 P. B.-A., No. 1428. Oogonia and oospores more depressed, 

 the former subdepressed- or depressed-globose ; vegetative cells 

 somewhat shorter and in comparison with the oogonia somewhat 

 stouter than in the type ; oogonia solitary or two. 



veg. cell, female, 19-12 n diam., 3-4/4 diam. long. 



veg. cell, male, S-io /x " 3-4 " " 



oog., 22-25 <" " 23-27 M long. 



oos., 19-23,0. " 15-22 M " 



anth. cell, 7-8 ^ <( 6-12 M " 



Maine, Cal. Europe. 



