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



filling the oogonium (membrane smooth ?) ; (suffultory cell of 

 same form as the other vegetative cells ?) ; dwarf males slightly 

 curved, near the oogonium ; antheridium exterior, i- (or more-?) 

 celled. 



veg. cell, 12-14 M diam., \~%.-\^ diatn. long. 



oog., 31-35 M " 28-33 M long. 



OOS., 27-29 M " 2 5-29 /" " 



nan. stipe, n M " 26 /u " 



anth. cell, 7-9 M " 9 /" " 



Pa. 



The description is incomplete, but is all that can be obtained 

 from Wood's figures and text ; no original specimens are 

 known. 



60. OE. MACRANDRIUM Wittrock, 1870, p. 130, PI. I, figs. 

 3-5 ; Wolle, 1887, p. 80, PI. LXXXII, figs. 1-3 ; Him, 1900, 

 p. 233, PI. XXXIX, fig. 240; Wittr. and Nordst., Alg. Ex- 

 sicc., Nos. 108, 505, 1217. Dioecious, nannandrous ; oogonia 

 single or 2-3, rarely 4 ; globose-oboviform, operculate, division 

 superior ; oospore globose, more rarely oboviform-globose, not 

 fully filling the oogonium, membrane smooth ; suffultory cell of 

 same form as the other vegetative cells ; terminal cell obtuse or 

 very shortly apiculate ; dwarf males on or near the oogonium, 

 stipe much curved, sometimes 2-3-celled ; antheridia i-7-celled. 



veg. cell, 15-20 M diam., 3-5 diam. long, 



oog., 36-42 M " 43-54 M long, 



oos., 31-37 M " 33-39 M " 



nan. stipe, 12-13 M " 2 4-33 M " 

 anth. cell, 9-10 /j. " 7-10 M " 



Mass., Pa. Europe. 



Var. AEMULANS Hirn, 1900, p. 235, PI. XXXIX, fig. 242 ; 

 Oe. Lundense Wolle, 1887, p. 79, PI. LXXVII, figs. 9 and 10 ; 

 Wittr., Nordst. and Lagerh., Alg. Exsicc., No. 1402. Some- 

 what smaller in all dimensions, as well as more variable ; 

 oogonia 2-6. 



Pa., Cal. So. America. 



From similar American species this is distinguished by the 

 manner in which the operculum separates from the lower part 

 of the oogonium ; the parts are not parallel, but more as if 

 hinged at one side and open at the other. 



61. OE. LONGATUM Kiitzing, 1853, p. n, PI. XXXIII, fig. 

 6; Wolle, 1887, p. 95, PI. LXXV, fig. 3; Hirn, 1900, p. 239, 

 PI. XL,, fig. 248; P. B.-A., No. 812. Dioecious, nannandrous; 



