140 THE (OE D'OEOMIAC EWE 
159. Oc. brasiliense Borge. 
(Pl. LIV, fig. 508.) 
1899, p. 4, Pl. 1, fig. 1; Hirn 1900, p. 272, Pl. XLVI, fig. 292. 
Dioecious, nannandrous, idioandrosporous; oogonium 1-3, sub- 
depressed-globose or subpyriform-globose, operculate, division median, 
broad; oospore subdepressed-globose, not quite filling oogonium, spore 
wall smooth; androsporangium to 5-seriate; vegetative cell capitellate; 
dwarf male obovoid, unicellular, on oogonium; vegetative cell 16-22 
35-95u; oogonium 53-63X52-59u; oospore 48-5345-50u; andro- 
sporangium 15-16 X 11—14y; dwarf male 10-12 14-19. 
Brazil. 
Characterized by its broad Ope and capitellate 
vegetative cells. : 
160. Oe. areschougii Wittrock. 
(Pl. LIM, fig. 500.) 
1870, p. 122. Pl. 1, figs. 1 and 2; 1874, p. 19, Pl. 1, figs. 10 and 11; Hirn 1900, 
p- 270; PEDSGLVLS fig. 289° 
Dioecious, nannandrous, gynandrosporous; oogonium 1-6, sub- 
depressed- or depressed pyriform-globose, operculate, division median, 
broad; oospore globose, rarely subdepressed-globose, not completing, 
oogonium longitudinally, spore wall smooth; androsporangium 1-6, 
subepigynous or hypogynous or rarely scattered: vegetative cell capi- 
tellate; basal cell elongate; terminal cell, usually the oogonium, apically 
obtuse; dwarf male obovoid, unicellular, on oogonium; vegetative cell 
8-13 X 35-754; oogontum 34-389X36-40u; oospore 22-26X22-25y; | 
androsporangium 9-11 10—-12u; antheridium 6-7 X 13-15uy. 
United States: New Jersey; Brazil; Finland, Germany, 
Sweden, Denmark; Greenland; Siberia. 
160a. Var. americanum Tiffany. 
(Pl. LII, fig. 501.) 
1927, p. 205, Pl. IX, figs. 8 and 9. 
Idioandrosporous; oogonium smaller; androsporangium to 11- 
seriate; vegetative cell 8-1240-80u; oogonium 29-36 26—-40y; 
oospore 23-26 X 22-26u; androsporangium 7-9 X7-11p. 
United States: Illinois. 
160b. Form robustum Hirn. 
(Pl. LITI, figs. 502 and 503.) 
1900, p. 271, Pl. XLVI, fig. 290; (?) Oe. obtruncatum var. oblatum Tilden, Amer. 
Alge No. 3, 1894; Oe. areschougu {. major Collins 1912, p. 88. 
Idioandrosporous; oospore larger; oogonium to 8-seriate; vegetative 
cell 12-17 X 36-120u; oogonium 36-40 X 36—-53y,;.0ospore 30-32 X 27-31; 
androsporangium 9-12 10-13; dwarf male 6-8 X 14—-15y. 
England; (?) Minnesota (U. S.). 
