OEDOGONIUM 147 
United States: New York (Smithtown Pond and Fish 
_Hatchery Pond, Long Island). 
Distinguished by its depressed-globose oogonia with verti- 
cillate folds forming pointed projections at the suture. It is 
larger than Oe. boreale below and is further distinguished by 
the shape and form of the oogonium. 
174. Oe. boreale Hirn. 
(Pl. LVI, fig. 542.) 
1900, p. 275, Pl. XLVIT, fig. 300. 
Dioecious, nannandrous; oogonium 1 (rarely 2), pyriform, wall 
thick and lamellose, medianly plicate, 16-19 verticillate folds, opercu- 
late, division supramedian; oospore subglobose (or subpyriform-globose), 
inflating oogonium, spore wall smooth; vegetative cell capitellate; 
dwarf male broadly obovoid, unicellular, on oogonium; vegetative 
cell 18-22 55-150; oogonium 58-65 X 67—78u; oospore 48-53 & 48-53u; 
dwarf male 14-16 < 15-20u. 
Finland. 
Cf. Oe. costatum, above. 
175. Oe. mirandrium Skuja. > 
(Pl. LIV, fig. 514.) 
1927, p. 101, Pl. II, figs. 12 and 12a. 
Dioecious, nannandrous, (?) idioandrosporous; oogonium | (rarely 2), 
subpyriform globose, operculate, division supramedian, or nearly 
superior; oospore globose, quite or not filling oogonium, spore wall 
smooth; dwarf male unicellular, ovoid, on oogonium; terminal cell 
obtuse; basal cell elongate; vegetative cell 13-20 28—-90u; suffultory 
cell 14-24 35-90; oogonium 40-48 x 38-43; oospore 35-42 « 35-42; 
dwarf male 9-26 x 11-35u. 
Latvia. 
Characterized by the supramedian operculum, unicellular 
dwarf male, and smaller suffultory cell. It bears some resem- 
blance to the macrandrous Oe. pringsheimii (No. 95.) 
176. Oe. contortum Hallas. 
(Pl. XLVIII, fig. 464. ) 
1905, p. 399, fig. 2; Hirn 1906, p. 11, Pl. IV, fig. 25. 
Dioecious, nannandrous, gynandrosporous; oogonium 1 (rarely 2), 
depressed-globose (rarely pyriform), operculate, division inframedian; 
oospore depressed (rarely globose), quite filling oogonium, spore wall 
smooth; androsporangium 1—5, curved, hypogynous or rarely epigynous 
or scattered; dwarf male obovoid, unicellular, on oogonium; vegetative 
cell 5-7 X20-60u; oogonium 23-35 xX 16-35u; oospore 16-28 x 12-21y; 
androsporangium 5-7 X7—-14y; dwarf male 4X 13u. 
Denmark. 
