156 DAE OE DOG ONDTACEAE 
190. Oe. praticolum Transeau. 
(Pl. LX, figs. 586-588.) 
1914, p. 298, Pl. XXIX. figs. 1-5; Tiffany 1926, p. 107, Pl. VII, figs. 82-84. 
Dioecious, nannandrous, idioandrosporous; oogonium 1-7, ellipsoid 
to globose-ellipsoid, often terminal, sometimes scattered; wall some- 
times rather thick, operculate, division stipreme, lid small and deciduous; 
oospore ellipsoid to globose-ellipsoid, quite filling the oogonium, wall 
smooth, androsporangium 1-20; vegetative cell slightly capitellate; 
basal cell usually elongate; terminal cell apiculate or extended into a 
long hyaline seta; antheriditum exterior, 1; vegetative cell, female 
16-26 X65-130u; vegetative cell of androsporangial filament 14-22 
56-1104; oogonium 48-6062-74y; oospore 46-58 X60-72y; andro- 
sporangium 20-24 x 18—22u; dwarf male stipe 8-14 21—28u; anther- 
idium 6-10 7-12u. 
United States: Illinois, Ohio, Iowa. 
Cf. Oe. obtruncatum (No. 189). 
191. Oe. supremum Tiffany. 
(Pl. LIX, figs. 573-576.) 
1924) p» 185, Pl. I, figs. 3 and 4, Pl. Il, figs. 4 and 5; 1926; p: 107; Pl) VILL, 
figs. 90 and 91. 
Dioecious, nannandrous, idioandrosporous; oogonium 1-4, globose 
or ellipsoid-globose, often terminal, operculate, division at the upper 
extremity of oogonium, lid often deciduous; oospore globose or ellipsoid- 
globose, filling oogonium, spore wall smooth; androsporangium 1-6; 
vegetative cell distinctly capitellate; basal cell elongate; dwarf male 
broadly obovoid, unicellular, on oogonium; vegetative cell 24-32 
60-132u; oogonium 66-78 X72-90u; oospore 60-66 66—-84u; andro- 
sporangium 26—28x30-40u; dwarf male 20-24 24-26u; basal cell 
28-32 X 90-110x. 
United States: Iowa. 
Cf. Oe. obtruncatum (No. 189). 
192. Oe. wabashense Tiffany. - 
(Pl. LX, figs. 584 and 585.) 
1927, p. 208, Pl. IX, figs. 3-5. 
Dioecious, nannandrous, gynandrosporous; oogonium 2-3, ellipsoid 
or ovoid, often terminal, operculate, division supreme, lid often decid- 
uous; oospore ellipsoid or ovoid (rarely globose), filling oogonium or 
not, spore wall smooth; androsporangium 1-3, subepigynous; vegetative 
cell capitellate; basal cell elongate; dwarf male on oogonium; anther- 
idium 1—?; vegetative cell 12-20 36-64; oogonium 36-42 44—60y; 
oospore 34-38 X40-55u; androsporangium 12-16 10—20u; dwarf male 
stipe 12-1624-40u; antheridium 7—-12X6-10yu; basal cell 18-20 
40-644. 
United States: Indiana, Ohio. 
Cf. Oe. ciliatum (No. 185) and Oe. obtruncatum (No. 189). 
