OEDOGONIUM 169 
superior; oospore globose, not filling oogonium, spore wall smooth; 
basal cell elongate; vegetative cell of considerable variation in diameter, 
the terminal cell often narrow and produced into a long hyaline seta; 
vegetative cell 6-27X12-480u; oogonium 37-4954—-76u; oospore 
28-35 X 28-35y. 
Denmark. 
Cf. Oe. tyrolicum (No. 14) and Oe. urbicum (No. 11). The 
chief characteristics of Oe. inflatum are the variable position of 
the pore, the considerable variation in size of the vegetative 
cell, and the long, narrow hyaline sete. 
226. Oe. warmingianum Wittrock. 
(Pl. XV, fig. 148.) 
1878, p. 140; Hirn 1900, p. 290, Pl. XII, fig. 65. 
Oogonium single, ellipsoid-ovoid, pore superior; oospore ellipsoid- 
globose, not filling oogonium in length, spore wall smooth; (? antheridium 
subepigynous) ; vegetative cell 8-9 X32-63y; oogonium 35 X 53y; oospore 
30X33u. 
Brazil. 
It is impossible to determine with any degree of certainty 
the position of this species in the genus because of the very 
inadequate description. 
227. Oe. calvum Wittrock. 
(Pl. XXXIV, figs. 309 and 310.) 
1874, p. 37; Oe. vesicatum Link in Rabenhorst Alg. Europe 1873; Hirn 1900, p. 
316, Pl. L, fig. 323. 
Oogonium 1-5, subdepressed-globose, operculate, division median; 
vegetative cell 7-9X22-40u; oogonium 27-30 25-30u. 
India. 
Cf. Oe. poecilosporum (No. 224), Oe. latiusculum (No. 81), 
and Oe. pratense (No. 80). 
228. Oe. inclusum Hirn. 
(Pl. XL, fig. 397.) 
1895, p. 21, Pl. 1, fig. 4; 1900, p. 318, Pl. L, fig. 324; Fremy and Meslin 1926, 
p. 124, fig. 8 
Oogonium 1, suboblong-ellipsoid, wall thickened; oospore ellipsoid 
or suboblong-ellipsoid, not completing oogonium or sometimes enlarg- 
ing it, spore wall slightly rugulose; basal cell elongate; vegetative 
cell 8-12X33-150y; oogonium 24-30 X48-55y; oospore 18-23 X38-48u. 
Finland, France. 
