42 T EO EDO:E ON DAGIE AGE 
smooth; antheridium 1—4; sperms 2, division horizontal; female vege- 
tative cell 9-12 X 30—95u, male 8-10 X 25—90u; oogonium 26-31 & 29-41; 
oospore 24-30 X 24-80u; antheridium 8-9 X 5-7. 
United States: Iowa, Illinois, New Jersey, Pennsylvania; 
Brazil; Australia. 
This species also resembles Oe. cardiacum (No. 15) but is 
distinguished by its smaller dimensions throughout. 
17. Oe. glabrum Hallas. 
(Pl. XIII, fig. 130.) 
1905, p. 408, fig. 18; Hirn 1906, p. 14, Pl. I, fig. 2. 
Dioecious, macrandrous; oogonium 1 (rarely 2), obovoid, pore 
superior; oospore globose or subglobose, not filling oogonium, spore 
wall smooth; antheridium 5-8; sperms 2, division vertical; terminal 
cell (sometimes the oogonium) broadly apiculate; female vegetative 
cell 16-26 X 120—240yu, male 21-25 60-150u; oogonium 56-58 X 63-86y; 
oospore 42-49 X 44-63; antheridium 20-22 7—-9u. 
Denmark. 
This species in general appearance is near the ‘‘cardiacum’ 
group. Its vertical division of the two sperms, the small 
size of its oospore in comparison to the oogonium, and the 
uniformly superior pore are characters that identify it and 
make it tenable as a species. 
’ 
18. Oc. lautumniarum Wittrock. 
(Pl. XIV, figs. 132 and 133.) 
In Wittr. and Nordst. Alg. Exs. No. 7, 1877; Hirn 1900, p. 92, Pl. V, fig. 27. 
Dioecious, macrandrous; oogonium 1, rarely 2, subobovoid-globose,. 
pore a little above median (rarely nearly superior); oospore subglobose, 
or sometimes subangular, filling oogonium, wall smooth, rarely thick- 
ened; antheridium 1-4; female vegetative cell 16—2240-110u, male 
15-20 X 45-1004; oogonium 40-49X45-5lu; oospore 36-46 35-47y; 
antheridium 14—17  7-10u. 
British Columbia; Finland, Germany, Sweden, Latvia. 
This species is separable from the ‘‘cardiacum’’ group 
largely by the varying position of the oogonial pore (from 
nearly median to nearly superior) and by a combination of 
cell sizes and shapes not found in any one of this group. 
19. Oe. intermedium Wittrock. 
(Pl. XIV, fig. 134.) 
In Wittr. and Nordst. Alg. Exs. No. 708, 1886; Oe. fragile Wittr. in zbid. No. 4, 
1877; Oe. vaucherii (Le Cl.) Al. Br. in ibid. No. 14, 1877, and in Rabenh. Alg. Eur. 
No. 2499, 1877; Hirn 1900, p. 94, Pl. V, fig. 31. 
Monoecious; oogonium 1, obovoid to obovoid-globose, pore superior; 
oospore globose or obovoid-globose, filling oogonium or nearly so, spore 
