134 THE OE DOEGONLACG EAE 
filling it, outer layer of spore wall smooth, median layer with 16-25 
longitudinal, continuous, rarely anastomosing, often curved, ridges— 
inner layer smooth; basal cell elongate; terminal cell, often an oogonium, 
obtuse; dwarf male goblet-shaped, curved, on the suffultory cell or 
oogonium; antheridium interior; vegetative cell 21-30*40-300y; 
suffultory cell 42-4875-110u; oogonium 57-66 70-100”; oospore 
51-62 60-754; androsporangium 23-80X12-30u4; dwarf male cell 
12-15 X 50-58n. 
United States: Iowa, Illinois, Ohio, Mississippi, Michigan; 
Denmark, France, Germany, Sweden, Rumania, Switzerland, 
England. 
149a. Form americanum Wolle. 
1887, p. 77, Pl. 81, figs. 20-22: Hirn 1900, p. 256. 
Smaller; dwarf male on oogonium; vegetative cell 17—21 X 22-62y; 
oogonium 45-50 55-63; oospore 39-40 X 4446y; dwarf male 12-15 
50-54 yu. 
United States: Pennsylvania. 
149b. Form ornatum (Wittrock) Hirn. 
(Pl. LI, figs. 488-490.) 
1900, p. 254, Pl. XLIII, fig. 267; Oc. cyathigerum Wittr. var. ornatum Wittr. 
1878, p. 134. 
Idioandrosporous; elongated dwarf males; vegetative cell 21-30 
60—270u; suffultory cell 39-48 x60-116u; oogonium 56-65 x 69-102u; 
oospore 54-60 65-83u; androsporangium 21—27 X 138-27y; dwarf male 
12-16 X60-75p. 
Mexico (Vera Cruz). 
149c. Form perfectum Hirn. 
(Pl. LI, figs. 486 and 487.) 
1900, p. 254; Pl. XLIII, fig. 268; Oe. cyathigerum Wittr. in Borge 1896, p. 5. 
Larger; androsporangium to 238-seriate; vegetative cell 22-35 
65-350u; suffultory cell 37-56 56-140u; oogonium 65-81 72-111; 
oospore 61-78 X65-85y; androsporangium 21-30 15-30u; dwarf male 
12-16 X 55-69. 
United States: Mississippi, Ohio; Brazil; Australia; India. 
149d. Var. ellipticum Magnus and Wille. 
(Pl. LII, fig. 493.) 
In Wille 1884, p. 40, Pl. 2, fig. 67; Hirn 1900. p. 255, Pl. XLIV, fig. 271; Fritsch 
and Rich 1924, p. 320, fig. 4 A-C. 
Oospore frequently not filling oogonium, quadrangular-ellipsoid 
or nearly ellipsoid or rarely subglobose; vegetative cell 19-80 30—-120y; 
suffultory cell 26-4340-125u; oogonium 50-63X68—94y; oospore 
48-57 X 45-664; dwarf male 15-18 X43-55y. 
United States: Ohio; Uruguay, Brazil; South Africa. 
