124 ree Ol DICK ON TEANGA AGE: 
The species should be compared with Oe. exospirale (No. 126). 
The variety acutum has smaller oospores and larger ribs; 
var. latviense has a distinctly above-median pore which is 
sometimes nearly superior. 
129. Oc. depressum Pringsheim. 
(Pl. XLVI, fig. 446.) 
1858, p. 69, Pl. 5, fig. 5; Hirn 1900, p. 249, Pl. XLII, fig. 261. 
Dioecious, nannandrous, gynandrosporous; oogonium 1 (rarely 2), 
depressed globose, pore median; oospore depressed globose, not filling 
oogonium; androsporangium 2-celled; dwarf male oblong-obovoid, on 
oogonium, antheridium interior; vegetative cell 8-9 x 25-54; oogonium 
28 X 26u; oospore 23 X 17-18u; dwarf male 4—5 x 14-16u. 
Germany; Greenland. 
Cf. Oe. semiapertum, below. 
130. Oe. semiapertum Nordstedt and Hirn. 
(Pl. XLVI, fig. 445.) 
In Hirn 1900, p. 250, Pl. XLIT, fig. 262. 
Dioecious, nannandrous, gynandrosporous; oogonium 1 (rarely 2), 
subhexagonal-globose to subpyriform-globose, pore median, rimiform, 
extending nearly half way round the oogonium; oospore globose or sub- 
globose, not filling oogonium, spore wall smooth; androsporangium 1-3, 
hypogynous or subepigynous; terminal cell apically obtuse; dwarf 
male subobovoid, on oogonium, antheridium interior; vegetative 
cell 9-12 X38-105yu; oogonium 32-35 X 33-40u; oospore 25-29 x 25-30; 
androsporangium 9-10 10-14y; dwarf male 8-9 Xx 14—15n. 
French Guiana. 
This species and Oe. depressum, above, are the smallest of 
nannandrous, medianly poriferous members of the genus having 
smooth and nearly globose oospores. Oe. depressum is separated 
by its smaller size and non-rimiform pore. 
131. Oc. gallicum Hirn. 
(Pl. XLVII, fig. 453.) 
NI ay p. 197, Pl. XXXII, fig. 201; Oe. flavescens Hass. in Roumeguere Alg. Exs. 
IN'O:: fo. 
Dioecious, nannandrous, (?) idioandrosporous; oogonium 1-2, 
subhexagonally globose, pore a little above median; oospore of same 
form as oogonium and quite filling it, spore wall smooth; dwarf male 
suberect, on suffultory cell (rarely oogonium), antheridium exterior, 
1-2; vegetative cell 17-22 51-120u; oogonium 43-48 x 44-54; oospore 
41-46 X39-44y; dwarf male stipe 11-16 26-80yu; antheridium 8-9X 
(1 1p. 
France. 
Cf. Oe. braunii, below. 
