OEDOGONIUM 67 
United States: Maine, California; Austria, England, Fin- 
land, France, Germany, Hungary, Sweden. 
The species and the varieties resemble Oe. cryptoporum 
(No. 3) except in their dioecious habit and are separated from 
each other chiefly on the basis of relative dimensions. The 
varieties are so widely distributed and so uniformly separable 
from the species that they must be regarded as distinct even 
though similar. 
5. Oe. calcareum Cleve. 
(Pl. XI, fig. 108.) 
In Wittrock 1870, p. 185; (?) Vesiculifera compressa Hassall 1845, p. 204, P1. 53, 
fig. 4; Hirn 1900, p. 78, Pl. I, fig. 9. 
Dioecious, macrandrous; oogonium | or rarely 2, depressed-globose, 
with median pore; oospore depressed-globose, filling oogonium, wall 
smooth; ileal ae to 8-seriate; sperm 1; vegetative cell 11-14X 
22-56u; oogonium 27-30 X 21-23; oospore 26- 28 X 20-21; antheridium 
iI 9— [2p 
England, Denmark, Sweden, Latvia; South Africa. 
The filaments of this species are often incrusted with lime. 
The depressed-globose oospore completely filling the oogonium 
and the robust appearance of the short-celled vegetative 
filaments are characteristic. 
6. Oece. sociale Wittrock. 
(Pl. XI, fig. 109.) 
In Wittr. & Nordst. Alg. Exs. No. 401, 1882; Oe. ochroleucum Kuetz. in Rabenh. 
Alg. Eur. No. 1280, 1862; Hirn 1900, p. 79, Pl. II, fig. 12. 
Dioecious, macrandrous; oogonium 1, subglobose, pore median; 
oospore globose (or subglobose), quite filling oogonium, cell wall smooth; 
antheridium 1-5, sperms 2 division horizontal; vegetative cell 9- 16X 
30-1304; oogonium 30-38 X33- AQu; oospore (26—) 28-35 X 28-35p; 
antheridium 12-148-1luy. 
United States: Illinois, Alabama, Mi§ssissippi; British 
Columbia; Austria, Germany, Sweden, Latvia; India, Tibet, 
Burma. | 
The oospore is usually quite globose. It is easily separable 
from its dioecious relatives by its larger size and by the 
presence of two sperms in the antheridium. 
7. Oe. cymatosporum Wittrock and Nordstedt. 
(Pl. XII, figs. 112 and 113.) 
In Wittr. 1870, p. 121; Oe. Magnusii Wittr. in Hirn 1895, p. 11; Hirn 1900, p. 80, 
IPA THIS reife als 
Monoecious; oogonium 1 or rarely 2, subdepressed-globose, pore 
median, rimiform; oospore depressed-globose, filling or not filling 
oogonium, spore wall of three layers: oute. smooth, middle scrobiculate, 
Cee 
