OEDOGONIUM tity 
116. Oe. oblongum Wittrock. 
(Pl. XXXVIII, fig. 367.) 
1872, p. 2; 1874, p. 15; Hirn 1900, p. 185, Pl. X XIX, fig. 181; Heering 1914, 
p. 218, fig. 319: Collins 1918, p. 66; Tiffany 1926, Oe INO, JEN, INU sakeg, AAS 
Monoecious; oogonium 1, oblong, operculate, division superior; 
oospore ellipsoid to ovoid, not filling oogonium longitudinally, spore 
wall smooth; antheridium 1-3, sperms 2, division horizontal; basal cell 
elongate; vegetative cell 6-11X20-86u; oogonium 20-2641-60y; 
oospore 19-23 X 30-36u; antheridium 6—9 X 7-9u. 
United States: Iowa, Illinois, Mississippi; Siberia; New 
Caledonia; India; Austria, Denmark, Finland, Germany, Russia, 
Norway, Latvia, Sweden. 
116a. Form majus (Nordstedt) Hirn. 
(Pl. XXXVIII, fig. 370.) 
1900, 185, Pl. XXIX, fig. 182; Oe. oblongum Wittr. var. majus Nordst. in 
Wittr. 1876, Ds 45, JPAL, 1B}, anise, 2all 
Vegetative cell 8-11X35-75u; oogonium 26-28 42-50u; oospore 
22-26 X 31-34; antheridium 8-9 X9-10u. 
United States: Michigan; Finland, Italy, Sweden; Morocco. 
116b. Form sphaericum (Hallas) Hirn. 
(Pl. XXXVIII, figs. 368 and 369.) 
1906, p. 18, Pl. III, fig. 12; Oe. sphaericum Hallas 1905, p. 406, fig. 13. 
Oospore globose; vegetative cell 6-11 20-85u; oogonium 21-28 
30-52u; oospore 16-26 X 16-26; antheridium 8X6; basal cell 9X 72u. 
Denmark. 
Cf. Oe. oblongellum (No. 115). The f. sphaericum is easily 
separated from the species by its globose oospore; f. majus 
has slightly larger oogonia. 
117. Oe¢e. itzigsohnii De Bary. 
(Pl. XXXIX, figs. 379 and 380.) 
1854, p. 56, Pl. 3, figs. 29-32; Wittr. 1870, p. 123; Oe. platygynum Wittr. in 
Eichler 1893, p. 2, Pl. 9, fig. 2; Hirn 1900, p. 177, Pl. XXVIII, fig. 167. 
Monoecious; oogonium 1, ellipsoid, with median, conically obtuse 
projections, appearing stellate in vertical view, with 7—10 radiations, 
operculate, division inframedian; oospore globose, not completing 
oogonium, spore wall smooth; antheridium 1-2; terminal cell apically 
obtuse or apiculate; vegetative cell 8-10 25-60u; oogonium 34-40 
32—40u; oospore 20-23 & 20-23u; antheridium 8-9 X 8-15u. 
United States: Massachusetts; Germany, Poland, Sweden, 
Austria, England, Bulgaria, Denmark, Latvia, Russia, France. 
