76 THE (OF Diode ON Ge Ace 
25. Oe. vaucherii (Le Clerc) Al. Braun; Wittrock. 
(Pl. XV, figs. 150 and 151.) 
(2?) Prolifera vaucherii Le Cl. 1817, p. 474, Pl. 23, fig. 4; (?) Oe. vaucheriti Braun 
1855, p. 40, Pl. 2, fig. 13; Wittr. 1870, p. 121; (2?) Oe. diandronites Carter 1858, p. 31, 
Pl. 3, figs. 8, 9-11; (?) Oe. monandronites Carter 1858, p. 38; Hirn 1900, p. 97, Pl. VI, 
fig. 36; Oe. vauchertt (Le Cl.) Al. Br.; Wittr. f. msulare Hirn 1900, p. 99, Pl. VI, 
fig. 37; Collins 1909, p. 232; Heering 1914, p. 207, fig. 308; Tiffany 1926, p. 100, 
Pi IVG ietoorr eb aeAcwNO@ssliZiaG: 
Monoecious; oogonium 1, obovoid to subovoid-globose, pore 
superior; oospore globose to subglobose, not filling oogonium, spore 
wall smooth and sometimes thick; antheridium 1-4; sperms 2, division 
horizontal; basal cell elongate; vegetative cell 20-30 X 32-118; oogonium 
40-58 X 45-65; Oospore 35-54 35—-55u; antheridium 17-380 6-L5uy. 
United States: Massachusetts, Michigan, Iowa, Illinois, 
Ohio, Mississippi; India; Denmark, France, Germany, Switzer- 
land, Italy, Sweden, Latvia. 
Oe. vaucherii resembles Oe. intermedium (No. 19) and Oe. 
fragile (No. 24). Hirn’s f. insulare is not distinct and is included 
with the species. The dimensions given above include the 
variations observed for the American material. 
26. Oe. richterianum Lemmermann. 
(Pl. XVI, fig. 156.) 
1895, p. 26, figs. 1-3; Oe. paludosum (Hass.) Kuetz. in Hirn 1895, p. 14; Hirn 
1900; p. 117, Pl. XII, fig. 63. 
Monoecious; oogonium 1-2, obovoid or subellipsoid, pore superior; 
oospore subobovoid or subellipsoid (rarely globose-ellipsoid), filling 
oogonium or not, spore wall smooth; antheridium 1-6, subhypogynous 
or subepigynous or scattered; sperms 2, division horizontal; basal cell 
elongate; vegetative cell 12-21 36-1264; oogonium 36-48 X48-74u; _ 
oospore 35-43 X438-59u; antheridium 12-15 6-10x. 
United States: Massachusetts; British Columbia; Germany, 
Finland: 
Distinguished by its combination of dimensions and by the 
horizontal division of the antheridium. Cf. Oe. upsaliense 
(No. 29). 
27. Oe. pseudoboscii Hirn. 
(Pl. XX, fig. 186.) 
1900, p. 291, Pl. XIII, fig. 67; Oe. neglectum Hirn 1895, p. 21, Pl. 1, fig. 1; Silf- 
venius 1903, p. 15, fig.; Iwanoff 1901, p. 48; Hirn 1906, p. 48, Pl. II, fig. 6. 
Monoecious; oogonium 1, subobovoid, pore superior; oospore 
ellipsoid-ovoid or ellipsoid, inflating lower part of oogonium, otherwise 
not filling it, spore wall smooth; antheridium 1-2, subepigynous; 
sperms 2, division horizontal; vegetative cell 8-14 x 64-275; oogonium 
41-50 X 75-105u; oospore 38-45 48-60u; antheridium 11-12 10-L1uy. 
United States: Illinois, Alabama, Massachusetts; Finland, 
Russia. 
