114 THE. OEDOGONTACEAE 
109c. Var. gracilescens Wittrock. | 
(Pl. XXXV, fig. 321.) 
In Wittr. and Nordst. Alg. Exs. No. 509, 1883; Oe. Lagerheimii Wittr. in ibid. 
No. 1018, 1893; Hirn 1900, p. 162, Pl. XXV, fig. 148; P. B. A. No. 518. 
More slender than the type; oogonium varying from obovoid- 
globose to subellipsoid; oospore globose to ovoid; vegetative cell 10-14 
30-70u; oogonium 33-39 < 33-51u; oospore 32-37 X 33-42u; antheridium 
9-10 X 7-9. 
United States: Massachusetts, Iowa, Missouri, Ohio, Illinois, 
Mississippi, Louisiana, Minnesota; Austria; Brazil; Morocco, 
Angola. 
109d. Var. hawaiense Nordstedt. 
(Pl. XXXV, fig. 320.) 
1878, p. 20, Pl. 2, figs. 9 and 10; Hirn 1900, p. 165, Pl. XXVI, fig. 147. 
Oogonium subobovoid-globose to pyriform-globose, not filled by 
oospore; terminal cell mucronate or shortly setigerous; vegetative cell 
10-16 X 20-64; oogonium 30-388X31-88u; oospore 27-32 27-33y; 
antheridium 8-11 6-8u. 
Hawail. 
109e. Var. uruguayense Magnus and Wille. 
(Pl. XXXV, fig. 324.) 
In Wille 1884, p. 39, Pl. 2, fig. 63; Oe. crispum (Hass.) Wittr. f. gracilis in Wittr. 
and Nordst. Alg. Exs. No. 704, 1886; Hirn 1900, p. 164, Pl. XXVI, fig. 145; Oe. 
crispum (Hass.) Wittr. var. uruguayense M. & W. f. proprium Hirn 1900, p. 164, 
Pl. XXVI, fig. 146. 
Oogonium subobovoid-globose, usually filled by oospore; antheridium 
subepigynous or hypogynous or scattered; vegetative cell 10-14 
16-5lu; oogonium 30-88 X 30-45y; oospore 27-35 X 27-374; antheridium ~ 
8-13 X 6-12p. 
United States: Pennsylvania; Argentina, Brazil. 
Oe. crispum is perhaps the commonest monoecious member 
of the genus among the operculate forms. Its vegetative cells 
are more slender than those of Oe. autumnale (No. 107) and there 
is less variation in the relative size of its oogonium and oospore 
than in Oe. obesum (No. 108). The forms and varieties of the 
species are separable from one another and the type largely 
on the basis of relative shapes and sizes of vegetative and 
reproductive cells. (See key). 
110. Oe. rupestre Hirn. 
(Pl. XXXVI, fig. 345.) 
1900; pz 168) sR. XexaVay fie. 1522 
Monoecious; oogonium 1, suboboviform-globose, operculate, division 
superior; oospore globose, not filling oogonium, spore wall smooth; 
antheridium 1-3, subepigynous or hypogynous; sperms 2, division 
