OEDOGONIUM 05 
61. Oc. foveolatum Wittrock. 
(Pl. XXIX, fig. 252.) 
1878, p. 1383; Hirn 1900, p. 106, Pl. VII, fig. 46. 
Monoecious; oogonium 1-2, obovoid to subellipsoid-globose, with 
superior pore; oospore globose to subellipsoid-globose, filling or not 
filling oogonium, outer spore wall scrobiculate; antheridium 1-7; sperms 
two, division horizontal; basal cell elongate, terminal cell apically 
obtuse; vegetative cell 14-23X35-115yu; oogonium 37-49X38-57un; 
oospore 33-46 X 34-48u; antheridium 15-19 & 8-12u. 
Brazil: ot. Phomas island: 
The only monoecious representative of the genus with 
scrobiculate oospores. 
62. Oe. scrobiculatum Wittrock. 
(Pl. XXIX, figs. 258 and 259.) 
as Wittr. and Nordst. Alg. Exs. No. 1018, 1898; Hirn 1900, p. 1838, Pl. XV, 
fig. 90. 
Dioecious, macrandrous; oogonium 1-3, obovoid or subellipsoid, 
pore superior; oospore of same form as oogonium and nearly filling it, 
outer spore wall scrobiculate, inner smooth; antheridium 1—?, sperms 2, 
division horizontal; female vegetative cell 16-2450-144u, male 
15-19 X45-110u; suffultory cell 21-3034-90yu; oogonium 40-48 
60-S88u; oospore 39-45 X48—57u; antheridium 13-15 8-12u. 
Ecuador. ° 
Cf. Oe. verrucosum (No. 63) ea Oe. tiffanit (No. 64). 
63. Oc. verrucosum Hallas. 
(Pl. XXXI, figs. 272-274.) 
1905, p. 408, fig. 17; Hirn 1906, p. 24, Pl. II, fig. 8. 
Dioecious, macrandrous; oogonium 1—2, broadly ellipsoid or obovoid- 
globose, pore superior; oospore globose or ellipsoid-globose, not filling 
oogonium, middle layer of spore wall scrobiculate; suffultory cell tumid; 
antheridium 4—?; sperms 2, division horizontal; basal cell elongate; 
terminal cell, frequently an oogonium, obtuse; vegetative cell, female 
11-26 X45-200u; oogonium 56-68 56-944; oospore 52-64 44-68u; 
antheridium 16 X 16u; suffultory cell 19-49 x 30—145y; basal cell 30-35 x 
45-160p. 
United States: Michigan; Denmark. 
Cf. Oe. scrobiculatum above and Oe. tiffanit below. The 
antheridial filaments of Oe. verrucosum are very short, usually 
consisting only of a holdfast cell and a few antheridial cells. 
64. Oe. tiffanii Ackley. 
(Pl. XXX, figs. 261-263.) 
1929, p. 304, Pl. XXXVI, figs. 15 and 16. 
Dioecious, macrandrous; oogonium 1-2, subdepressed-globose or 
broadly pyriform-globose, pore superior; oospore globose, nearly filling 

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