THE GREEN ALGAE OF NORTH AMERICA 235 



Oe. stagnate Wolle, 1887, p. 88, PL LXXXIII, figs. 3-6. 

 Oogonia slightly less swollen and usually a little shorter, obovi- 

 form-globose or sub-globose ; oospore globose or subglobose ; 

 dimensions between the type and forma valida. N. Y., Mex- 

 ico, So. Dakota, Minn., Montana, Neb., Cal., Vancouver. 



Africa, So. America. 



Forma DIVERSUM Hirn, 1900, p. no, PI. IX, fig. 54; Oe. 

 stagnale Tilden, Amer. Algae, Nos. 122, 545. A robust form, 

 with oospores varying from depressed-globose to cylindric-glo- 

 bose ; filaments a third to a fourth larger than in the type. 

 Colorado, Montana, Minn. 



Forma DEBARYANUM (Chmiel.) Hirn, 1900, p. 108, PI. VIII," 

 fig. 50. Oospore usually globose or subglobose, rarely cylin- 

 drical-globose, 38-50 /j. diam., 40-53 /* long; other dimensions 

 slightly smaller than in the type. Greenland. Russia. 



A variable species, a number of other forms occurring in 

 other countries ; we have no species for which it is liable to be 

 mistaken, if the organs of both sexes are well developed. 



16. OE. CAPiLiyARE (L.) Kiitzing, 1843, p. 255, PI. XII, 

 figs, i-io; Wolle, 1887, p. 87, PI. I^XXXIII, figs. 7 and 8; 

 Hirn, 1900, p. 112, PI. XI, fig. 58. Dioecious; oogonia sin- 

 gle, little or not at all swollen, cylindrical or subcylindrical, 

 pore superior ; oospore not filling the oogonium, globose or 

 somewhat cylindric-globose, sometimes slightly constricted at 

 the middle, rarely depressed-quadrangular-globose, membrane 

 smooth ; male plant about the same size as the female or slightly 

 less ; antheridia i-4-celled, usually alternating with vegetative 

 cells ; spermatozoids binate, division horizontal ; basal cell 

 elongate, terminal cell obtuse or short-apiculate. 



veg. cell, female, 38-55 M diam., 1-2 diam. long, 



veg. cell, male, 35-50 ^ " 1-2 " 



oog., 40-60 (L " 45-75 p. long. 



- oos., 30-52 M " 36-65 M " 



anth. cell, 30-48^ " 5-10 fj. " 

 Only known here by the general report by Wolle, without 

 locality. Europe. 



MACRANDRIA, PORIFERA, ELLIPSOSPORA. 



17. OE. UPSALIENSE Wittrock, 1870, p. 125 ; Hirn, 1900, p. 

 115, PI. XII, fig. 60; Wittr. and Nordst., Alg. Exsicc., No. 

 1 8. Monoecious ; oogonia single, oboviform or suboblong- 

 ellipsoid, pore superior ; oospore same form as the oogonium, 

 filling the latter, membrane smooth; antheridia i-2-(rarely 3-) 

 celled, subhypogynous ; antheridia, oogonia and vegetative cells- 



