120 LHE OE DOIGONTACEAE 
antheridium exterior, 1-4; vegetative cell slightly capitellate; filament 
20-41 (-50) celled; vegetative cell, terminal 9-12170-805yu, median 
20-27 X 57—160u, basal 22-35 X 79-230; suffultory cell 41-58 X 93-130,; 
oogonium 60-67X70-79u; oospore 53-64 60-76u; androsporangium 
20-25 X 2240u; dwarf male stipe 12-1947-68u; antheridium 9-13 
17-20u. 
United States: Nebraska (near Lincoln). 
The only nannandrous species combining the characters of 
supramedian pore and punctate oospore. 
121. Oe. aster Wittrock. 
(Pl. XLII, fig. 416.) 
1872, p. 4; 1874, p. 29; De Toni 1889, p. 62; Hirn 1900, p. 198, Pl. XXXII, fig. 
202; Fremy and Meslin 1926, p. 124, fig. 9. 
Dioecious, nannandrous; oogonium 1, subdepressed-globose, pore 
median; oospore subdepressed-globose or subglobose, not completely 
filling oogonium; outer layer of spore wall echinate; suffultory cell 
sometimes a little swollen; terminal cell obtuse; dwarf male a little 
curved, on suffultory cell, stipe sometimes 2-celled, antheridium exterior, 
1-2; vegetative cell 7-13 X50-110y; oogonium 33-35 X 34-39; oospore 
(with spines) 31-32 X 25-30; dwarf male stipe 6—7 X 20-25; antheridium 
5-6 X 7-8y. 
United States: Illinois; Sweden,-Germany, Latvia, France; 
Ceylon. 
Oe. aster is near Oe. pugens (No. 125) but the latter is larger 
in all dimensions. 
122. Oe. hystricinum Transeau and Tiffany. 
, (Pl. XLII, fig. 414.) 
1919, p. 240, Pl. XIV, figs. f-i; Tiffany 1926, p. 102, Pl. VIII, figs. 85 and 86. 
Dioecious, nannandrous, idioandrosporous; oogonium 1, globose or 
somewhat obovoid, pore median; oospore globose to subglobose, nearly 
filling the oogonium, outer spore wall densely covered with spines; 
suffultory cells swollen; androsporangium 3-6; terminal cell obtuse; 
basal cell elongated; dwarf male nearly straight, resting on the suffultory 
cell, antheridium exterior, 1; female vegetative cell 8-15 x 42-100y, male 
6-9 X 50-67; suffultory cell 16-19 42-70u; oogonium 30-40 X 36-53. ; 
oospore (including spines) 23-38 X28-43u; androsporangium 6-8 X 
8—15u; dwarf male stipe 6-10 X 20-32u; antheridium 5-6 X 6—10y. 
United States: Illinois, Iowa. 
This species is near Oe. hystrix, below, but differs in its 
smaller size and in its swollen suffultory cells. 
123. Oe. hystrix Wittrock. 
(Pl. XLII, fig. 417.) 
1870, p. 133; Wolle 1887, p. 87, P1. 84, fig. 8; Hirn 1900, p. 213, Pl. XXV, fig. 218. 
Dioecious, nannandrous, gynandrosporous (or possibly idioan- 
drosporous); oogonium 1, ellipsoid, pore median; oospore ellipsoid, 
