OEDOGONIUM 143 
capitellate; dwarf male unicellular, obovoid, small, on oogonium; 
vegetative cell 12-15X25-60u; oogonium 30-36 22-291; oospore 
23-28 X 20-24u; androsporangium 10--13X5-7y; dwarf male 5-6 8-9u. 
Sweden. 
This species combines the inframedian position of the 
operculum, ridged oogonium, capitellate vegetative cell, and 
non-tumid suffultory cell. It differs from Oe. platygynum, 
below, in its larger dimensions. 
167. Oe. platygynum Wittrock. 
(Pt. LVI, fig. 544.) 
1872, p. 1; 1874, p. 17, Pl. 1, figs. 5-9; Oe. platygynum Wittr. f: major West 1891, 
p. 109, Pl. 18, fig. 1; Hirn 1900, p. 276, Pl. XLVII, figs. 301 and 302; P. B. A. 
No. 1677. 
Dioecious, nannandrous, gynandrosporous and idioandrosporous; 
oogonium 1-2, depressed obovoid, with 7-12 (more often 8) rounded 
projections arranged in a whorl around the middle, operculate, division 
inframedian; oospore depressed- or subdepressed-globose, not quite 
filling oogonium,-spore wail smooth; suffultory cell sometimes tumid; 
androsporangium 1-3; vegetative cell evidently capitellate; terminal 
cell apically obtuse; dwarf male unicellular, obovoid, small, on 
oogonium; vegetative cell 5-11X14-50u; oogonium 21-30 16-24u; 
oospore 17-24 13-204; androsporangium 6-8 X7-8yu; dwarf male 4-5 
X<8-10u. 
United States: New Jersey, Pennsylvania, Florida, Minne- 
sota; Brazil; England, Denmark, Finland, Germany, Ireland, 
Norway, Latvia, Sweden; Africa; Ceylon. 
167a. Form obtusum Hirn. 
(Pl. LVI, fig. 545.) 
1900. p. 277, Pl. XLVII, fig. 303. 
Idioandrosporous, oogonium a little less depressed, processes obtusely 
rounded; vegetative cell 6-10X14-50u; oogonium 22-26 18-24y; 
oospore 17-19 14-15yu; androsporangium 6-8X8-10u; dwarf male 
4—5 X7-9p. 
England, Sweden. 
167b. Var. continuum Nordstedt. 
(Pl. LVI, fig. 546.) 
1888, p. 12, Pl. 1, figs. 16 and 17; Hirn 1900, p. 278, Pl. XLVII, fig. 305. 
Oogonium to. 5-seriate, projections more truncately rounded; 
suffultory cell enlarged; vegetative cell 848u; suffultory cell 12-14x 
25-40; oogonium 28-32 X 21-26yu; oospore 22 20y; ? androsporangium 
15-17 X 12h. 
New Zealand. 
