OEDOGONIUM 1 
135b. Var. majus Wille. 
(Pl. XLVI, fig. 457.) 
1880, p. 68; Hirn 1900, p. 212, Pl. XXV, fig. 217. 
Larger, pore median; vegetative cell 15-2330-68u; oogonium 
36-42 (-48) x (36-) 41-45; oospore 34-40 X39-43yu; androsporangium 
14-18 X8-10yu; dwarf male stipe 7-9 X 18-30u; antheridium 6-8 X6-10y. 
United States: Mississippi, Massachusetts; Austria, Finland, 
- Germany, Norway, Sweden. 
The species is readily identified among the nannandrous 
forms by its sexangular-ellipsoid oogonia and oospores. Var. 
angulosum is smaller and var. majus is larger than the species. 
136. Oc. stellatum Wittrock. 
' (Pl. XLV, fig. 441.) 
1870, p. 129; 1874, p. 27, Pl. 1, fig. 15; (2) Oe. spinos permum Reinsch 1875, p. 81, 
Pi 15; fig: 1- Hirn 1900, p. 205, Pl: XOGXTV,, fig. 210: 
Dioecious, nannandrous, gynandrosporous; oogonium 1-3, obovoid- 
globose, pore superior; oospore globose, quite filling oogonium, outer 
spore wall with 4—7 somewhat spirally arranged ribs, appearing definitely 
‘dentate on the margin, sometimes anastomosate; androsporangium 1-3, 
usually subepigynous; basal cell elongate; terminal cell slender, sub- 
hyaline, apically obtuse; dwarf male suberect, on suffultory cell, 
antheridiumi 1—2; vegetative cell 15-35 40-225u; oogonium 51-64 
56-70u; oospore (with ribs) 50-58 X50-58y; androsporangium 14-19 
13—20u; dwarf male stipe 11-13 X 45-52y; antheridium 6-9 X 8-13u. 
United States: Alabama, Florida; Africa; Brazil; Australia; 
| Finland, Germany, Italy, Sweden; Ceylon. 
This alga is often placed with the species having spirally 
arranged ribs on the oospore. The ribs are really irregular 
rows of dentate spines, and I have thus separated it in the key. 
137. Oc. silvaticum Hallas. 
(Pl. XLIX, fig. 472.) 
1905, p. 404; fig. 9; Hirn 1906, p. 21, Pl. III, fig..16. 
Dioecious, nannandrous, gynandrosporous; oogonium 1, ellipsoid- 
globose, pore superior; oospore globose, not filling oogonium; suffultory 
cell subtumid; dwarf male suberect, on suffultory cell, antheridium 
exterior; vegetative cell 12-15%65-120u; suffultory cell 2060,; 
oogonium 3750p; oospore 28X28u; androsporangium 7X 17u; dwarf 
male stipe 1139u; antheridium 7 X7u. 
Denmark. 
In general appearance this species resembles Oe. flavescens 
(No. 133), but differs in its smaller size and superior pore. The 
suffultory cells are not nearly so much enlarged relatively as 
in Oe. borisianum, below. 
