EO THE OEDOGONIACEAE 
105. Oe. sphaerandrium Wittrock and Lundell. 
(Pl. XXXVI, fig. 337.) 
In Wittr. 1874, p. 7; Oe. subcapitellatum Hirn 1895, p. 13, Pl. 1, fig. 1; Hirn 1900, 
p. 155, Pl. XXIV, figs. 129 and 130; Borge 1913, p. 31, fig. 2. 
Monoecious; oogonium 1-4, subpyriform- to subdepressed-globose, 
operculate, division a little above median; oospore subdepressed- or 
depressed-globose, nearly filling oogonium, spore wall smooth, 
antheridium to 6-seriate, subepigynous or scattered; sperm 1; vegetative 
cell capitellate, sometimes nodulose; basal cell subhemispherical, 
terminal cell piliform; vegetative cell 4-10 X6—40u; oogonium 18-23 < 
18-23; oospore 16-21 14-19; antheridium 6-8 X 5-6u. 
Austria, Finland, Germany, Sweden; Siberia. 
The capitellate (sometimes nodulose) vegetative cells, the 
small size, and supramedian operculum are characteristic. 
106. Oc. pithophorae Wittrock. 
(Pl. XXXVI, fig. 338.) 
1878, p. 141; Hirn 1900, p. 157, Pl. XXIV, fig. 134. 
Monoecious; oogonium 1, pyriform-globose, operculate, division 
superior; oospore globose, almost filling oogonium, spore wall smooth, 
often thickened; antheridium 1—?, subepigynous; basal cell elongate; 
vegetative cell 9-11X24-48y; oogonium 26-30X27-35yu; oospore 
25-29 X 24-29u; antheridium 8—10X7—9u. 
St. Thomas, West Indies. 
Epiphytic on Pithophora cleveana Wittrock. 
Cf. Oe. porrectum (No. 97). 
107. Oe. autumnale Wittrock. 
(Pl. XXXVI, fig. 341.) 
1874, p. 11; Hirn 1900, p. 167, Pl. XXVI, fig. 151. 
Monoecious; oogonium 1, obovoid-globose, operculate, division 
superior; oospore globose or subglobose, completing oogonium (or nearly 
so), spore wall smooth; antheridium 1-2, subepigynous, hypogynous, or 
scattered; sperms 2, division horizontal; basal cell elongate; terminal 
cell broadly apically acute; vegetative cell 16-2025—-50u; oogonium 
39-45 X45—-51u; oospore 37-42 X 37-44; antheridium 15-18 X9-10y. 
United States: Pennsylvania; Finland, Italy, Sweden, Latvia. 
Cf. Oe. crisbum (No. 109). 
108. Oe. obesum (Wittrock) Hirn. 
(Pl. XXXVII, fig. 347.) 
1900, p. 166, Pl. XXVI, fig. 148; Oe. pyrulum Wittr. var. obesum Wittr. 1876, 
p. 44, Pl. 18, fig. 20. 
Monoecious; oogonium 1, obovoid-globose, operculate, division 
superior; oospore globose, not quite filling oogonium, spore wall smooth, 
often thickened; antheridium 1-2, subepigynous or more rarely sub- 
