66 THe 10.EDO:COINWACCE AGE 
3a. Var. vulgare Wittrock. 
(Pl. XI, fig. 102.) 
1874, p. 7; Wolle 1887, p. 70, Pl. 74, figs. 1 and 2; Oe. cryptoporum Wittr. in Hirn 
1896, p. 2; Hirn 1900, p. 73, Pl. I, fig. 2; (?) Oe. spetsbergense Wittr. 1874, p. 37 and 
mm Hirn 1900, p. 316, Pl. L; fig."322. 
Smaller; oogonium 1-5; vegetative cell 5-815-48u; oogonium 
18-25 X 18-26; oospore 16—-23X15-19y; antheridium 5-7 X9-12u. 
United States: New Jersey, Michigan, Illinois, Massa- 
chusetts, Pennsylvania, Utah; Australia; Ko Chang; Ceylon; 
Austria, England, France, Germany, Italy, Spain, Norway, 
Sweden. 
The variety is much more widely distributed and has 
smaller vegetative cells and shorter oogonia than the species. 
The small sized filaments with rather depressed-globose oogonia 
are characteristic. 
4. Oe. rufescens Wittrock. 
(Pl. XI, fig. 105.) 
1870, p. 134; 1874, p. 32; Hirn 1900, p. 76, Pl. I, fig. 4; Collins 1909, p. 229; 
PY Becae Noe o2i: 
Dioecious, macrandrous; oogonium 1-8, obovoid- or depressed- 
obovoid-globose, pore median, rimiform; oospore globose or depressed- 
globose, filling oogonium or nearly so, spore wall smooth; antheridium 
to 12-seriate; sperm 1; female vegetative cell 8-10X34~-70u, male 
7-9 X30-54u; oogonium 22-2422-30u; oospore 21-23X17-22n; 
antheridium 6-8 X8-12u. 
United States: Connecticut, Rhode Island, Michigan, [lli- 
nois, Alabama, Ohio; Austria, Denmark, England, Germany, 
' Sweden, Latvia; South Africa. 
4a. Var. exiguum (Elfving) Tiffany nov. comb. 
(Pl. XI, fig. 106.) 
Oe. rufescens f. exiguum (Elfv.) Hirn 1900, p. 76, Pl. 1, fig. 5; Oe. exiguum Elfv. 
in Hirn 1895, p. 19. 
Vegetative cells a little smaller; oospore subdepressed-globose; 
antheridium 3; vegetative cell 5-9 22-88; oogonium 22—24 x 20-28y; 
oospore 20-22 17—-23u; antheridium 5X 10-12u. 
United States: Illinois, Alabama, MiQussissippi; Finland, 
France; Southern Tibet. 
’ 4b. Var. lundellii (Wittrock) Tiffany. 
(Pl. XI, fig. 107.) 
1929, p. 75; Oe. Lundellii Wittr. 1874, p. 32; Oe. Rothit Breb. in Rabenh. Alg. 
Eur. No. 1374, 1862; Oe. rufescens Wittr. subsp. Lundellii (Wittr.) Hirn 1900, p. 77, 
Pl. I, fig. 6; Oe. rufescens Wittr. subsp. Lundellii (Wittr.) Hirn f. elongatum Hirn 
1900, p. 78, Pl. I, fig. 8; P. B. A. No. 1428. 
Vegetative cells wider in proportion to oogonium than in type; 
oogonium depressed-globose; vegetative cell 8-1230-75yu; oogonium 
22-25 X 21-27; oospore 19-23 15-22u; antheridium 7-9 X6-12y. 
