OEDOGONIUM 139 
156. Oe. rigidium Hirn. 
(Pl. LIII, figs. 506 and 507.) 
1900, p. 237, Pl. XL, fig. 244. 
Dioecious, nannandrous, gynandrosporous; oogonium 1, obovoid- 
globose, operculate, division superior; oospore globose, nearly filling 
oogonium, spore wall smooth, often thick; androsporangium 1-2, 
epigynous, subepigynous or hypogynous; vegetative cell broadly 
capitellate; terminal cell obtuse; dwarf male curved, on oogonium, 
antheridium exterior, 1—?; vegetative cell 12-14388—58yu; oogonium 
35-39 (42) X38—45u; oospore (380—-) 34-38 34-38; androsporangium 
10-11 X 11—12u; dwarf male stipe 7-9 x 18—22u; antheridium 5-7 X 6-7. 
Brazil; South Africa. 
The only nannandrous species having the combination of 
superior position of the oogonial operculum, and capitellate 
vegetative cells. 
157. Oe. bengalense Hirn. 
(Pl. LITT, figs. 504 and 505.) 
1900, p. 268, Pl. XLVI, fig. 287. 
Dioecious, nannandrous, idioandrosporous; oogonium 1-4, sub- 
depressed-globose to ovoid, operculate, division median, rather wide; 
oospore subdepressed-globose or globose; quite filling oogonium, spore 
wall smooth; androsporangium 1-4; vegetative cell capitellate; basal 
cell elongate; terminal cell, not rarely the oogonium, apically obtuse; 
dwarf male obovoid, unicellular, on oogonium; vegetative cell 14-19 
45-110u; oogonium 46-5444-54u; oospore 48-48X43-48y; andro- 
sporangium 14-15 13-18u; dwarf male 12-13X 16-18n. 
India: Bengal. 
Cf. Oe. indicum, below. 
158. Oe. indicum Hirn. 
(PI. LIV, fig. 509.) 
1900, p. 269, Pl. XLVI, fig. 288. 
Dioecious, nannandrous, gynandrosporous; oogonium 1—2, depressed- 
globose or depressed obovoid-globose, operculate, division median, 
narrow but distinct; oospore depressed-globose, completing oogonium, 
spore wall smooth; androsporangium 1—2—?, subepigynous; vegetative 
cell broadly capitellate; basal cell elongate; dwarf male obovoid, un1- 
cellular, on oogonium; vegetative cell 20-2550-110u; oogonium 
57-64 X48-53u; oospore 55-6143-50u; androsporangium 19-20 
8-10u; dwarf male 11-14 18n. 
India. 
This species together with Oe. bengalense above combine the 
characters of capitellate vegetative cells and median position of 
a narrow operculum. Oe. indicum is the larger of the two. 
Cf. Oe. areschougii (No. 160), Oe. brasiliense (No. 159), and 
Oe. confertum (No. 161). 
