OEDOGONIUM 107 
United States: Iowa, Ohio, Kentucky. 
This species is easily recognized by the considerable difference 
between the diameter of the vegetative cells and that of the 
relatively much larger oogonia. Its oogonia are larger than 
those of Oe. welwitschit above. 
94. O6ce. dioicum Carter. 
(Pl. XXXVII, figs. 356 and 357.) 
1858, p. 30, Pl. 3, figs. 1-2, 5-8, 18-16; Hirn 1900, p. 175, Pl. XXVIII, fig. 163. 
Dioecious, macrandrous; oogonium 1, obovoid-globose, operculate, 
division superior; oospore globose, not filling oogonium, spore wall 
smooth; male plants a little smaller than female; antheridium 10-20, 
sperms (?) 2, division vertical; female vegetative cell about 32 80—-110x, 
male about 28 70—-95u; oogonium about 82 92u. 
India. 
No data beyond those of Carter are available, and Oe. 
dioicum is retained here largely because it cannot be definitely 
discarded upon our present knowledge of the species. 
95. Oe. pringsheimii Cramer; Wittrock. 
(Pl. XXXV, figs. 325 and 326.) 
Cramer 1859, p. 17, Pl. 1, fig. C 1-4; Wittr. 1870, p. 185; Wittr. 1874, p. 33, 
Pl. 1, figs. 16 and 17; Hirn 1900, p. 170, Pl. XX VII, fig. 155; Oe. pachydermatos porum 
Nordst. 1878, p. 21, Pl. 2, fig. 18-15; Oe. pringsheimi Cram.; Wittr. var. Nordstedtiu 
Wittr. f. pachydermatosporum (Nordst.) Hirn 1900, p. 173, Pl. X XVII, fig. 160; 
Collins 1909, p. 246; Heering 1914, p. 202, fig. 284; Tiffany 1926, p. 98, Pl. V, figs. 
45 and 46. 
Dioecious, macrandrous; oogonium 1—6, subovoid-globose, opercu- 
late, division superior; oospore globose, nearly filling oogonium, spore 
wall smooth, often thickened; antheridium to 10-seriate, often alter- 
nating with vegetative cell; sperms 2, division horizontal; basal cell 
elongate, terminal cell broadly apiculate or obtuse; female vegetative 
cell 14-20 X 28-100u, male 12-16 24—-64y; oogonium 35-43 x 36—-46y; 
oospore 30-37 X 30-87; antheridium 10-15 6-9u. 
United States: Iowa, New York, Pennsylvania, Florida, 
Ohio, Utah; Africa, Afghanistan; Australia; Austria, Denmark, 
England, Finland, Italy, Norway, Latvia, Sweden, Switzerland. 
95a. Var. abbreviatum Hirn. 
(Pl. XXXV, fig. 331.) 
1900, p..173, Pl. XX VII, fig. 161. 
Smaller; vegetative cell broader; oogonium 1, obovoid-globose, 
nearly filled by oospore; vegetative cell 10-1315-39u; oogonium 
28-32 X 30-35; oospore 27-30 X 27-30y. 
Brazil. 
