OEDOGONIUM L553 
185. Oe. ciliatum (Hassall) Pringsheim. 
(Pl. LIX, fig. 583.) 
Vesiculifera ciliata Hass. 1845, p. 202, Pl. 52, fig. 2; Oe. ciliatum Pringsh. 1856, 
p. 227, Pl. I, figs. 1-10; Pringsh. 1858, p. 70, Pl. 4, figs. 1-14, and Pl. 5, fig. 8; Oe. 
piliferum Auerswald in Rabenh. Alg. Sachs. 1855; Hirn 1900, p. 248, Pl. XLI, 
fig. 253; Heering 1914, p. 183, fig. 252; Tiffany 1926, p. 106, Pl. IX, figs. 98 and 99. 
Dioecious, nannandrous, gynandrosporous; oogonium 1-7, ovoid, 
to ovoid-ellipsoid (rarely nearly ellipsoid), operculate, division superior 
or nearly supreme; oospore ovoid to subellipsoid, rarely globose, nearly 
filling oogonium, spore wall smooth; androsporangium to 8-seriate, 
often subepigynous; basal cell elongate; terminal cell setiform; dwarf 
male curved, on oogonium; antheridium .exterior, 1; vegetative cell 
14-24 35-92u; oogonium 43-5055-72u; oospore 40-47 44-57u; 
androsporangium 14-20 10-204; dwarf male stipe 10-15 24-31y; 
antheridium 8-10 10-11. 
United States: Iowa, Ohio; England, Finland, Germany, 
Spain, Sweden, Latvia; British Columbia. 
Characterized by its setiform terminal cells and ovoid to 
ovoid-ellipsoid oogonia. The division of the oogonium is quite 
often practically supreme rather than superior. It is near 
Oe. wabashense (No. 192); the latter has capitellate vegetative 
cells, supreme operculum, and smaller oogonia. 
186. Oc. spectabile Hirn. 
(Pl. XLI, figs. 403-405.) 
1900, p. 284, Pl. XLIX, fig. 317. 
Dioecious, nannandrous, idioandrosporous; oogonium 1, obovoid- 
ellipsoid or obovoid, operculate, division superior; oospore ellipsoid, 
nearly filling oogonium, spore wall smooth; androsporangtum to 16- 
seriate, the androsporangial part of the filament often curved; basal 
cell elongate; dwarf male broadly obovoid, unicellular, on oogonium; 
vegetative cell 20-32 25-90u; oogonium 42-50*63-72u; oospore 
40-48 X 55-62u; androsporangium 19-27 11-19; dwarf male 11-14 
16-21. 
United States: Mississippi; Australia. 
Characterized by the wide variation in cell diameter, the 
unicellular dwarf male, and the pronounced curve of the terminal 
part of the androsporangial filament. It is similar to Oe. 
implexum (below) which is smaller and has relatively more 
slender vegetative cells. 
187. Oe. implexum Hirn. 
(Pl. XLI, figs. 400 and 401.) 
1900, p. 283, Pl. XLIX, fig. 316. 
Dioecious, nannandrous, gynandrosporous; oogonium 1-3, sub- 
obovoid-ellipsoid, operculate, division superior; oospore ellipsoid, 
filling oogonium, spore wall smooth; androsporangium to 20-seriate 

