232 TUFTS COLLEGE STUDIES, VOL. II, No. 3 



veg. cell, female, 9-12 M diatii., 3-8 diani. long. 



veg. cell, male, S-io /j. " 3-9 " " 



oog., 26-31 /u " 29-41 M long. 



oos., 24-30 M " 24-30 n " 



anth. cell, 8-9 M " 5-7 /* " 



N. J., Pa. So. America. 



Resembling Oe. cardiacum, but a more slender plant, and with 

 pore higher up on the oogonium. 



9. OE. VARIANS Wittrock and Lund in Wittrock, 1874, p. 

 ii ; Him, 1900, p. 89, PI. IV, fig. 23 ; Oe. polymorphnni Wolle, 

 1887, p. 73, PI. L,XXIV, figs. 16-19. Monoecious; oogonia 

 single, very rarely 2, depressed- or subdepressed-pyriform- 

 globose, pore nearly superior ; oospore globose, not filling the 

 oogonium, membrane smooth ; antheridia to g-celled, scattered ; 

 spermatozoids binate, division horizontal ; basal cell elongate, 

 terminal cell obtuse. 



veg. cell, i2-i6^diam., 3-9 diam. long, 



oog., 35-5 v. " 34-55 /x long. 



OOS., 31-41 M " 30-41 fJi " 



anth. cell, H-I5M " 5-7 M " 



N. J. Europe. 



Characterized specially by the high position of the pore, and 

 by the antheridia, in series of several, irregularly placed among 

 the vegetative cells. 



10. OE. FRAGILE Wittrock, 1870, p. 120 ; Wolle, 1887, p. 71, 

 PI. LXXIV, figs. 4-6 ; Him, 1900, p. 96, PI. V, fig. 33 ; P. B.-A., 

 No. 1477. Monoecious ; oogonia single, globose or subobovi- 

 form-globose, pore superior ; oospore globose, filling the oogo- 

 nium, membrane smooth ; antheridia i-3-celled, hypogynous or 

 subepigynous ; spermatozoids binate, division horizontal ; basal 

 cell elongate. Fig. 81. 



veg. cell, 12-17 M diam., 4-.7 diam. long. 



oog., 42-50 M " 44-55 M long. 



oos., 39-46 M " 39-46 M " 



anth. cell, 12-15 M " 10-12 M " 



Mass., Pa. Europe. 



Beside the type, Hirn notes and figures, PI. VI, fig. 34, a 

 form, not named, from Massachusetts, with dimensions of cells, 

 oogonia and oospores about 3 ^ more than the type ; the an- 

 theridia may be up to 6 in a series, occurring irregularly in the 



filament. 



11. OE. VAUCHERII (L,eCl.) A. Braun, 18553, p. 40, PI. II, 

 fig. 13 ; Hirn, 1900, p. 97, Pi. VI, fig. 36; Wittr. and Nordst., 



