OEDOGONIUM S1 
United States: Illinois, Massachusetts, Iowa, Ohio, Missis- 
sippi; Denmark, Sweden; India; South Africa. 
36a. Var. gracilius Wittrock. 
. (Pl. XIV, figs. 141 and 142.) 
1878, p. 142; Hirn 1900, p. 101, Pl. VI, fig. 40; Collins 1909, p. 233; Tiffany 1926, 
Pl. IV, figs. 37 and 38. : 
Smaller than the type, with vegetative cell usually shorter; vegetative 
cell 20-25%X40-100u; oogonium 36-4246-57u; oospore 34-39 
36—-44y; antheridium 19-22 7-10uz. 
United States: Iowa, New York, Illinois, Ohio, Mississippi; 
Germany; Mexico; South Africa. 
The species and variety are separated mainly on the basis 
of size. The rather regularly globose oospores, with heavy 
walls, within obovoid-globose oogonia are characteristic. 
37. Oc. capilliforme Kuetzing; Wittrock. 
(Pl. XIX, figs. 172 and 173.) ; 
Kuetz. 1853, p. 12. Pl. 37, fig. 3; Wittrock 1872a, p. 21; 1874, p. 31; Oe. dioicum 
Petrovsky 1861, p. 611, Pl. 13, fig. 6-10; Hirn 1900, p. 107, Pl. VIII, fig. 49; Collins 
1909, p. 234; Heering 1914, p. 196, fig. 282; Tiffany 1926, p. 92, Pl. III, figs. 22 and 23. 
Dioecious, macrandrous; oogonium 1, obovoid to subovoid, with 
superior pore; oospore variable, ovoid-globose, cylindric-globose, sub- 
globose, or globose, not filling oogonium, spore wall smooth; 
antheridium 2-8, often alternating with the vegetative cell; sperms 2, 
division horizontal; basal cell elongate, terminal cell apically obtusé or 
apiculate; female vegetative cell 28-38 X 42-120, male 25-30 x 40-100y; 
oogonium 42—50 X 51—62yu; oospore 37-45 X 40—50y; antheridium 20-25 x 
8-10u. 
United States: Missouri, Iowa, Ohio, Mississippi, Illinois; 
France, Russia, Sweden; Patagonia; 8. Africa. 
37a. Form debaryanum (Chmielevsky) Hirn. 
(Pl. XIX, fig. 174.) 
1900, p. 108, Pl. VIII, fig. 50; Oe. De Baryanum Chmiel. 1889, p. 1, Pl. 1, figs. 
1 and 2; Tiffany 1926, p. 92, Pl. III, figs. 20 and 21. 
Oospore globose or subglobose; female vegetative cell 25-37 
38-130u, male 22-27X35-100u; oogonium 46-56 52-66yu; oospore 
38-50 X40-53u; antheridium 18-24 5-10u. 
United States: Iowa; Greenland; Russia. 
37b. Form lorentzii (Magnus and Wille) Hirn. 
(Pl. XIX, fig. 175.) 
1900, p. 109, Pl. IX, fig. 51; Oe. lorentzii Magnus and Wille in Wille 1884, p. 51, 
Pl. 3, figs. 99-101. 
Oogonium obovoid to obovoid-globose; oospore usually globose” or 
subglobose, sometimes cylindric-globose; female vegetative cell, 26-34 x 
