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



oboviform-ellipsoid, pore superior; oospore ellipsoid, not filling 

 the oogonium, membrane smooth ; male plant generally some- 

 what stouter than the female; antheridia i-4-celled; spermato- 

 zoids binate, division vertical. 



veg. cell, female, 30-36 M diam., 3-6/^ diam. long, 



veg. cell, male, 32-45 " 2-3^ " 



oog., 53-47 M " 84-108 M long, 



oos., 51-57 M " 69-85 M " 



anth. cell, 30-43 M " 11-20 M " 



Pa. and N. J., according to Wolle, but questioned by Him. 

 The species so much resembles forms of Oe. grande that it is 

 quite possible that Wolle's plants were really the latter, which 

 occurs at a number of American stations. 



30. OE. GRANDE Kiitzing, 1845, p. 200; Wolle, 1887, p. 

 95, PI. LXXVI, fig i ; Him, 1900, p. 143, PI. XXI, fig. 105 ; 

 P. B.-A., No. Sn. Dioecious; oogonia single, rarely 2-5, 

 slightly swollen, suboboviform, pore superior ; oospore same 

 form as the oogonium, not quite filling it, membrane smooth ; 

 male plant slightly more slender than the female ; antheridia 

 i-8-celled ; spermatozoids binate, division vertical ; basal cell 

 elongate. 



veg. cell, female, 28-37 n diam., 2^-5 diam. long, 



veg. cell, male, 28-33 /* " 2^-5 



oog., 49-60 n " 86-100 M long, 



oos., 47-58 M " 64-93 ^ " 



anth. cell, 25-33 ,u " n-iS M " 



Ontario, Me., Mass., Conn., Pa., Cal. Europe, Australia. 



A species of varying forms, some of which have received 

 names in Hirn's monograph, some being only mentioned, with- 

 out name. Among the latter is the form from Massachusetts, 

 distributed as P. B.-A., No. 519, with veg. cells 4-11 diam. 

 long, oogonia up to 126 p. long, oospores to 104 /*, the diameter 

 about as in the type ; while among the named varieties is 



Var. ANGUSTUM Him, 1900, p. 146, PL XXI, fig. no; 

 P. B.-A., No. 410. Slender, veg. cells and oogonia elongate, 

 antheridia to 36 cells, oogonia sometimes 4 in succession. 



veg. cell, female, 19-30 p. diam., 3/^- 11 diam. long, 



veg. cell, male, 19-25 M " 4-9 



oog., 42-52 /u " 62-1 10 M long, 



oos., 40-50 fj. " 60-89 M " 



anth. cell, 18-22 M " 7-15 M " 



Mass. So. America. 



