OEDOGONIUM 83 
39. Oc. biforme Nordstedt. 
(Pl. XVI, figs. 161 and 162.) 
In Wittrock and Nordstedt Exs. 1880; Hirn 1900, p. 147, Pl. XXII, fig. 112. 
Dioecious, macrandrous; oogonium 1 (rarely 2), pore superior, 
cylindric-obovoid; oospore oblong-ellipsoid to subglobose or nearly 
globose, generally not filling oogonium, spore wall smooth; antheridium 
to 21-seriate; sperms 2, division vertical; female vegetative cell 22-32 
55-140u; male 18-28X45-140u; oogonium 37—-5248-90u; oospore 
36-48 X 40-70u; antheridium 18-28 x 6-15uy. 
Brazil, Paraguay, Ecuador. 
Near Oe. oboviforme (No. 46) and Oe. grande (No. 45); 
distinguished chiefly by its cylindric-obovoid oogonium. 
40. Oe. anomalum Hirn. 
(Pl. XVIII, figs. 170 and 171.) 
1900, p. 112, Pl. X, fig. 55; Oe. stagnale Kuetz. var. variabilis Lewin 1888, p. 17, 
Me ees: 44-48; Heering 1914, p. 197, fig. 277; Tiffany 1926, p. 91, Pl. I, figs. 
an C 
Dioecious, macrandrous; oogonium 1, subovoid or cylindric-ovoid, 
pore superior; oospore globose or subglobose, not filling oogonium, 
spore wall smooth; antheridium 4-13, sperms 2, division vertical; 
terminal cell apically obtuse; female vegetative cell 40-50 80-3800uz, 
male 33-42x80-240u; oogonium 54-6468—-75u; oospore 48-60 
52-61u; antheridium 30-40 6-18u. 
United States: Iowa; Spain. 
This species has some of the appearances of Oe. capillare 
(No. 35), particularly in the relatively small difference between 
the diameter of the vegetative cells and that of the oogonia. 
41. Oe. fabulosum Hirn. 
(Pl. XXV, figs. 215 and 216.) 
900s pe 114s Pl xl fies 595° = 
Dioecious, macrandrous; oogonium 1, little tumid, cylindrical, pore 
superior; oospore globose or ellipsoid, not filling oogonium in length, 
spore wall smooth; antheridium seriate; sperms 2, division vertical; 
vegetative cell 74-85 115-210u; oogonium 81-96 X 104-133; oospore 
75-89 X 78-104; antheridium 68-80 X 7—22z. 
Brazil. 
41a. Var. maximum (West) Hirn. 
(Pl. XXV, figs. 217 and 218.) 
1906, p. 13, Pl. II, fig. 5; Oe. maximum West 1901, p. 75, Pl. IV, figs. 39-41. 
Oogonium wall thick; oospore subglobose to subcylindrical, filling 
oogonium or nearly so; basal cell elongate; terminal cell obtuse or 
broadly apiculate; vegetative cell 70-93 X 105-335yu; oogonium 75-107 X 
75-136; oospore 70-100 X65-110u; antheridium 65-86 X 7—20u. 
Siam (Koh-chang). 
