90 Tre OE DiO'E ONE NOeRAE 
52. Oe. paulense Nordstedt and Hirn. 
(Pl. XXVI, fig. 224.) 
In Hirn 1900, p. 292, Pl. XIV, fig. 80; Schmidle 1901, p. 344, Pl. XII, fig. 1; 
Hirn 1906, p. 45, Pl. II, fig. 5. 
Monoecious; gogonium 1, subellipsoid or ellipsoid-ovoid, pore 
superior; oospore ellipsoid, not or quite filling oogonium, spore wall of 
three layers: outer layer smooth, middle layer with 18-22 longitudinal 
ribs, entire and sometimes anastomosate, inner layer smooth; 
antheridium 1-2, subepigynous; sperms 2, division horizontal; vege- 
tative cell 10-15 X50-120u; oogonium 33-88 X 43-68; oospore 30-36 X 
38—45u; antheridium 10-146-S8u. 
Brazil; Australia. 
Schmidle’s record of this species from South America 
definitely placed it in the monoecious group. Its small size 
and fewer ribs on the oospore are characteristic. 
53. Oc. paludosum (Hassall) Wittrock. 
(Pl. XXVI, fig. 231.) 
Oe. paludosum Wittr. 1870, p. 124; (2?) Vesiculifera paludosa Hass. 1845, p. 199, 
Pl. 52, fig. 3; Hirn 1900, p. 120, Pl. XIII, fig. 69; Collins 1909, p. 237. 
Monoecious; oogonium 1, ellipsoid, pore superior; oospore ellipsoid, 
filling oogonium, spore wall in three layers: outer and middle layers 
with 27-35 longitudinal ribs, continuous, rarely anastomosate; 
antheridium 1-8, scattered, often in the upper part of the filament; 
sperms 2, division vertical; vegetative cell 15-20 50-140u; oogonium 
39-48 X 66-84; oospore 36-45 X 54-63u; antheridium 14-16 6-13u. 
United States: Illinois, Pennsylvania; British Columbia, 
Norway, England, Sweden. 
53a. Var. americanum Nordstedt. 
(Pl. XXVII, fig. 233.) 
In Hirn 1900, p. 121, Pl. XIII, fig. 72; Collins 1909, p. 237. 
Oogonium larger; vegetative cell 14-23 x 45-156; oogonium 54-63 X 
75-90u; oospore 49-57 X 69—75u; antheridium 12-18 X 7—-12u. 
United States: South Carolina. 
53b. Var. parvisporum Hirn. 
(Pl. XXVI, fig. 232.) 
1900, p. 120, Pl. XIII, fig. 70; (2?) Oe. pringsheimiana Archer 1868, p. 295; (?) Oe. 
archerianum Cooke 1884, p. 157; Borge 1913, p. 63, fig. 1. 
Oogonium subellipsoid or suboblong-ellipsoid; oospore not filling 
oogonium; antheridium subepigynous or subhypogynous or scattered; 
vegetative cell 15-2045-120u; oogonium 38-44X70-86y; oospore 
35-41 X 54-60u; antheridium 15-17 X7-12uy. . 
United States: Illinois, Michigan, Ohio; Spain, Sweden. 
